Guyton and Hall Physiology Chapter 18 - Nervous Regulation of the Circulation
93 Questions
0 Views

Guyton and Hall Physiology Chapter 18 - Nervous Regulation of the Circulation

Created by
@PrizeMeerkat

Podcast Beta

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What role does norepinephrine play in the control of heart activity during exercise?

  • It stimulates vasoconstrictive response. (correct)
  • It directly increases the heart rate. (correct)
  • It inhibits the vasomotor center.
  • It enhances the effect of vasodilation.

    • What initiates the baroreceptor reflex for arterial pressure control?

  • Reductions in blood flow
  • Decreased muscle activity
  • Changes in metabolic demand
  • Increased arterial pressure (correct)

    • Which area of the nervous system is primarily responsible for increasing arterial pressure during exercise?

  • Cerebral cortex
  • Reticular activating system (correct)
  • Peripheral nervous system
  • Autonomic nervous system

    • What mechanism primarily leads to vasodilation in muscle vasculature during increased metabolism?

    <p>Local vasodilatory mechanisms</p> Signup and view all the answers

    What effect does the activation of cardio-acceleratory areas have during heavy exercise?

    <p>Increases arterial pressure.</p> Signup and view all the answers

    What is the primary function of the vasomotor center in the brain?

    <p>Control of blood vessel diameter</p> Signup and view all the answers

    Which neurotransmitter is mainly involved in the actions of the vasomotor center?

    <p>Norepinephrine</p> Signup and view all the answers

    How does the vagus nerve influence heart activity?

    <p>By decreasing heart rate</p> Signup and view all the answers

    Which of the following areas is primarily associated with the vasodilator mechanisms?

    <p>Medulla</p> Signup and view all the answers

    What area of the brain does the vasomotor center mainly reside in?

    <p>Reticular substance of the medulla</p> Signup and view all the answers

    Which of the following is not a function of the vasomotor center?

    <p>Enhancing metabolic activity of skeletal muscle</p> Signup and view all the answers

    Which system primarily works alongside the vasomotor center to control circulation?

    <p>Sympathetic nervous system</p> Signup and view all the answers

    What effect does vasoconstriction primarily have on blood vessels?

    <p>Decreases diameter of blood vessels</p> Signup and view all the answers

    What is the primary result of excitation in the posterolateral portions of the hypothalamus?

    <p>Excitation of sympathetic vasoconstrictor tone</p> Signup and view all the answers

    How does the anterior portion of the hypothalamus influence vasomotor activity?

    <p>It can cause mild excitation or inhibition</p> Signup and view all the answers

    What is the rate at which sympathetic vasoconstrictor nerve fibers fire under normal conditions?

    <p>0.5 to 2 impulses per second</p> Signup and view all the answers

    What effect does stimulation of the cortical motor area have on the vasomotor center?

    <p>It excites the vasomotor center</p> Signup and view all the answers

    What is the term used to describe the partial state of constriction in blood vessels maintained during normal conditions?

    <p>Vasomotor tone</p> Signup and view all the answers

    What happens when a spinal anesthetic is administered in relation to sympathetic nerve impulses?

    <p>It blocks sympathetic nerve impulses</p> Signup and view all the answers

    What areas of the brain can influence the vasomotor center?

    <p>Various parts of the cerebral cortex</p> Signup and view all the answers

    Which brain structures are mentioned to have an excitatory or inhibitory effect on the vasomotor center?

    <p>Amygdala and hippocampus</p> Signup and view all the answers

    What could be the result of increased sympathetic vasoconstrictor tone?

    <p>Increased blood vessel constriction</p> Signup and view all the answers

    Which of the following best describes the relationship between the hypothalamus and cardiovascular function?

    <p>The hypothalamus provides generalized excitatory control over cardiovascular function</p> Signup and view all the answers

    What is the primary function of the vasodilator area located in the medulla?

    <p>Decrease heart rate and contractility</p> Signup and view all the answers

    What role does the vasomotor center play in the body?

    <p>It regulates vasoconstriction and vasodilation</p> Signup and view all the answers

    How does increased vasoconstriction typically affect heart activity?

    <p>It increases heart rate and contractility</p> Signup and view all the answers

    Which nerves primarily send sensory signals to the nucleus tractus solitarius?

    <p>Vagus and glossopharyngeal nerves</p> Signup and view all the answers

    What is the effect of the reticular substance's lateral neurons on the vasomotor center?

    <p>They excite the vasomotor center</p> Signup and view all the answers

    What distinct ability does the hypothalamus have regarding the vasomotor center?

    <p>It can exert powerful excitatory or inhibitory effects</p> Signup and view all the answers

    What generally happens to heart activity when the vasoconstrictor system is inhibited?

    <p>Heart rate and contractility increase</p> Signup and view all the answers

    Which part of the central nervous system influences the activities of the vasomotor center?

    <p>The hypothalamus</p> Signup and view all the answers

    Which area is identified as the sensory area controlling the vasomotor center?

    <p>Nucleus tractus solitarius</p> Signup and view all the answers

    What is the relationship between the vasomotor center's activity and arterial pressure regulation?

    <p>It directly controls arterial pressure through reflex mechanisms</p> Signup and view all the answers

    What effect does norepinephrine have on arterial pressure?

    <p>It leads to a temporary increase in arterial pressure.</p> Signup and view all the answers

    Which part of the vasomotor center is responsible for increasing heart pumping activities?

    <p>The lateral portion of the vasomotor center.</p> Signup and view all the answers

    How does the vasomotor center decrease heart rate?

    <p>By transmitting parasympathetic impulses through the vagus nerves.</p> Signup and view all the answers

    What happens when norepinephrine is destroyed?

    <p>Arterial pressure returns to normal levels.</p> Signup and view all the answers

    Which mechanism is primarily involved in controlling vascular constriction?

    <p>The vasomotor center together with the sympathetic nervous system.</p> Signup and view all the answers

    What effect does spinal anesthesia have on arterial pressure?

    <p>It decreases arterial pressure.</p> Signup and view all the answers

    What role does the sympathetic nervous system play in heart activity during increased demands?

    <p>It increases heart rate and contractility.</p> Signup and view all the answers

    What does the term 'vasomotor tone' refer to?

    <p>The baseline level of vascular constriction.</p> Signup and view all the answers

    How do the dorsal motor nuclei of the vagus nerves influence heart activity?

    <p>They transmit inhibitory signals to decrease heart rate.</p> Signup and view all the answers

    What is the primary response when the need to decrease heart pumping arises?

    <p>The vasomotor center activates parasympathetic pathways.</p> Signup and view all the answers

    What is the primary area of the vasomotor center responsible for producing vasoconstrictor impulses?

    <p>Anterolateral portions of the upper medulla</p> Signup and view all the answers

    Which of the following best explains the function of sympathetic vasoconstrictor fibers?

    <p>They induce vasoconstriction in various organs such as the kidneys and intestines.</p> Signup and view all the answers

    How does norepinephrine primarily function in the body?

    <p>It acts as a vasoconstrictor hormone in the bloodstream.</p> Signup and view all the answers

    What area influences the distribution of vasoconstrictor impulses throughout the body?

    <p>Anterolateral medulla</p> Signup and view all the answers

    What characterizes the sympathetic vasoconstrictor system in relation to the total vascular system?

    <p>It carries large numbers of vasoconstrictor fibers with fewer vasodilator fibers.</p> Signup and view all the answers

    Which area of the brain is primarily responsible for regulating sympathetic vasoconstrictor activity?

    <p>Reticular substance of the medulla</p> Signup and view all the answers

    What effect does stimulation of the vasodilator center in the brain generally have on blood vessels?

    <p>Causes vasodilation</p> Signup and view all the answers

    What primary action does the vagus nerve perform in relation to the heart?

    <p>Transmits parasympathetic signals to reduce heart rate</p> Signup and view all the answers

    Which statement best describes the role of the sympathetic chain in relation to heart activity?

    <p>It is involved in increasing heart rate during stress</p> Signup and view all the answers

    How does the activation of the vasomotor center generally influence blood pressure?

    <p>It activates vasoconstriction causing an increase in blood pressure</p> Signup and view all the answers

    What happens to sympathetic discharge when baroreceptor signals inhibit secondary signals in the medulla?

    <p>Sympathetic discharge is minimized.</p> Signup and view all the answers

    Which body part experiences minimized pressure decrease after baroreceptor signals are processed?

    <p>Head and upper body.</p> Signup and view all the answers

    What is the primary physiological function of the nucleus tractus solitarius?

    <p>To receive and process sensory signals for arterial pressure control.</p> Signup and view all the answers

    When baroreceptors are denervated, what is the expected outcome on arterial pressure control?

    <p>Arterial pressure becomes less controlled.</p> Signup and view all the answers

    How is the sympathetic nervous system generally affected by baroreceptor activation?

    <p>It is inhibited to reduce blood pressure.</p> Signup and view all the answers

    What percentage of occurrence would likely be noted when arterial pressure readings are taken?

    <p>A normal range around 100%.</p> Signup and view all the answers

    Which of the following best describes the relationship between baroreceptor signaling and vascular function?

    <p>Baroreceptor signaling directly influences sympathetic nerve impulses.</p> Signup and view all the answers

    What is a likely physiological consequence of strong sympathetic discharge throughout the body?

    <p>Enhanced metabolic activity and blood flow.</p> Signup and view all the answers

    What change is likely seen in the interaction between secondary signals and arterial pressure regulation?

    <p>Secondary signals are inhibited to increase pressure.</p> Signup and view all the answers

    In the context of a pressure change, how do primary and secondary signals interact?

    <p>Secondary signals can inhibit primary baroreceptor activity.</p> Signup and view all the answers

    Hering's nerve is associated with the regulation of arterial pressure through baroreceptors.

    <p>True</p> Signup and view all the answers

    The internal carotid artery is primarily a sensory pathway for the glossopharyngeal nerve.

    <p>False</p> Signup and view all the answers

    The carotid body acts as a chemoreceptor detecting changes in blood oxygen levels.

    <p>True</p> Signup and view all the answers

    The vagus nerve is not involved in the baroreceptor system for controlling arterial pressure.

    <p>False</p> Signup and view all the answers

    The common carotid artery bifurcates into the internal and external carotid arteries.

    <p>True</p> Signup and view all the answers

    Sympathetic stimulation decreases heart rate and contractility.

    <p>False</p> Signup and view all the answers

    The parasympathetic nervous system plays a minor role in regulating the heart compared to the sympathetic nervous system.

    <p>True</p> Signup and view all the answers

    Sympathetic nerve fibers originate solely in the lumbar region of the spinal cord.

    <p>False</p> Signup and view all the answers

    Parasympathetic nerve fibers to the heart are mainly carried by the vagus nerves.

    <p>True</p> Signup and view all the answers

    The sympathetic nervous system has no influence on the vascular function in most tissues.

    <p>False</p> Signup and view all the answers

    Baroreceptors respond more rapidly to stationary pressure than to rapidly changing pressure.

    <p>False</p> Signup and view all the answers

    The baroreceptor feedback mechanism is least effective at arterial pressures around 150 mm Hg.

    <p>False</p> Signup and view all the answers

    A decrease in arterial pressure can lead to loss of consciousness if not corrected quickly.

    <p>True</p> Signup and view all the answers

    The carotid sinus reflex operates by raising the aortic pressure immediately during a decrease in arterial pressure.

    <p>False</p> Signup and view all the answers

    The rate of impulse firing from baroreceptors increases during diastole.

    <p>False</p> Signup and view all the answers

    Baroreceptors help maintain constant arterial pressure when a person changes from lying down to standing up.

    <p>True</p> Signup and view all the answers

    An acute rise in mean arterial pressure does not significantly impact the rate of impulse transmission in baroreceptors.

    <p>False</p> Signup and view all the answers

    Baroreceptors do not respond to changes in pressure within a fraction of a second.

    <p>False</p> Signup and view all the answers

    The body's ability to adjust arterial pressure does not vary based on the individual’s posture.

    <p>False</p> Signup and view all the answers

    A temporary overcompensation occurs when arterial pressure changes due to the baroreceptor reflex.

    <p>True</p> Signup and view all the answers

    Match the following hormones with their primary effects on blood vessels:

    <p>Norepinephrine = Causes vasoconstriction Epinephrine = Stimulates both vasoconstriction and vasodilation Alpha-adrenergic receptors = Respond to vasoconstrictor signals Beta-adrenergic receptors = Cause vasodilation in specific tissues</p> Signup and view all the answers

    Match the following effects with their corresponding physiological changes in response to sympathetic nervous system activation:

    <p>Constricted arterioles = Increased total peripheral resistance Constricted veins = Increased venous return to the heart Simultaneous secretion of epinephrine = Systemic circulation enhancement Inhibition of parasympathetic signals = Increased heart rate</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Vasoconstriction = Narrowing of blood vessels Total peripheral resistance = Overall resistance against blood flow Sympathetic vasoconstrictor system = Regulates blood vessel contraction Cardioaccelerator functions = Increases heart rate and contractility</p> Signup and view all the answers

    Match the following components of the nervous system with their roles in arterial pressure modulation:

    <p>Sympathetic impulses = Increase arterial pressure Adrenal medullae = Secretes hormones into the bloodstream Alpha-adrenergic receptors = Cause vasoconstriction in vascular smooth muscle Beta-adrenergic receptors = Facilitate vasodilation in select tissues</p> Signup and view all the answers

    Match the following outcomes with their related mechanisms during sudden changes in arterial pressure:

    <p>Vasoconstriction of arterioles = Increased blood pressure Vasoconstriction of veins = Increased blood return to the heart Release of norepinephrine = Strengthened sympathetic response Reciprocal inhibition of parasympathetic signals = Promotes heart activity</p> Signup and view all the answers

    Match the following physiological responses to their corresponding triggers:

    <p>Sympathetic vasodilation = Onset of exercise Vasovagal syncope = Emotional disturbances Increased arterial pressure = Heavy exercise Decreased arterial pressure = Sudden cardiovascular inhibition</p> Signup and view all the answers

    Match the following agents with their roles in controlling arterial pressure:

    <p>Epinephrine = Stimulates beta-adrenergic receptors Nitric oxide = Released by vascular endothelium Acetylcholine = Stimulates nitric oxide release Norepinephrine = Increases blood flow during exercise</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Vasodilation = Widening of blood vessels Sympathetic system = Controls fight or flight responses Vagal cardioinhibitory center = Slows heart rate Vasomotor center = Regulates blood vessel diameter</p> Signup and view all the answers

    Match the following physiological reactions to their characteristics:

    <p>Rapid nervous control = Begins within seconds Emotional fainting = Causes loss of consciousness Anticipatory increase in blood flow = Occurs before muscle activity Acute rise in arterial pressure = Can double within 5-10 seconds</p> Signup and view all the answers

    Match the following concepts with their effects on blood flow:

    <p>Increased blood flow = During heavy exercise Decreased blood flow = In emotional fainting Immediate increase in pressure = Sympathetic activation Nitric oxide release = Vasodilation in muscles</p> Signup and view all the answers

    Study Notes

    Vasomotor Center

    • Located in the reticular substance of the medulla and lower portion of the pons
    • Responsible for controlling vasoconstriction and vasodilation, and regulating heart activity
    • Contains three areas: vasoconstrictor, vasodilator, and sensory.

    Sympathetic Vasomotor Tone

    • Continuous signals from the vasoconstrictor area of the vasomotor center to sympathetic vasoconstrictor nerve fibers lead to partial constriction of blood vessels
    • This helps maintain a baseline level of blood pressure
    • Spinal anesthesia blocks sympathetic nerve impulses, demonstrating the effect of vasoconstrictor tone on arterial pressure.

    Control of the Vasomotor Center

    • Higher brain centers (hypothalamus, cerebral cortex) can excite or inhibit the vasomotor center, influencing blood pressure and heart rate
    • The hypothalamus has a significant role, with the posterolateral portions causing excitation and the anterior portion causing either excitation or inhibition.
    • Stimulation of the motor cortex excites the vasomotor center, increasing heart rate and arterial pressure.

    Functions of the Vasomotor Center

    • Regulation of vascular tone through vasoconstriction and vasodilation
    • Regulation of heart rate and strength of contractions through sympathetic and parasympathetic nerve fibers
    • Control of blood pressure under various conditions, including exercise and stress
    • Coordination of cardiovascular responses through its interplay with higher brain centers.

    Baroreceptor Arterial Pressure Control

    • Baroreceptors, located in large arteries, detect changes in blood pressure
    • Increased blood pressure stretches baroreceptors, triggering signals to the CNS
    • The CNS then sends feedback signals to the vasomotor center, adjusting heart rate and blood vessel constriction to maintain normal blood pressure.
    • This is a negative feedback mechanism, meaning it reduces the stimulus that initiated it.

    Sympathetic Nerve Control During Exercise

    • During exercise, the vasomotor center increases sympathetic activity, leading to increased vasoconstriction, heart rate, and contractility
    • This helps deliver more oxygen and nutrients to working muscles.

    Anatomy of the Vasomotor Center

    • The vasomotor center is located in the reticular substance of the medulla and lower third of the pons.
    • It transmits parasympathetic impulses through the vagus nerves to the heart.
    • It transmits sympathetic impulses through the spinal cord and peripheral sympathetic nerves to arteries, arterioles, and veins throughout the body.
    • Sympathetic nerves carry vasoconstrictor nerve fibers (more numerous) and a few vasodilator fibers.
    • The sympathetic vasoconstrictor effect is strongest in the kidneys, intestines, spleen, and skin.

    Important Areas of the Vasomotor Center

    • Vasoconstrictor area: located bilaterally in the anterolateral portions of the upper medulla.
      • Neurons from this area distribute fibers throughout the body.
    • Vasodilator area: located mainly in the lower medulla.
      • Neurons from this area project to sympathetic vasoconstrictor neurons and inhibit vasoconstriction.

    Neural Control of Blood Pressure

    • The vasomotor center controls blood pressure by adjusting the degree of sympathetic vasoconstriction.
    • Increased sympathetic discharge (e.g., during excitement, exercise) constricts blood vessels, increasing blood pressure.
    • Decreased sympathetic discharge (e.g., during sleep) relaxes blood vessels, decreasing blood pressure.

    Baroreceptors and Blood Pressure Regulation

    • Baroreceptors: sensory receptors in the aortic arch and carotid sinuses that detect changes in blood pressure.
    • Baroreceptor reflex: Responds to changes in blood pressure to regulate it.
    • Mechanism of Baroreceptor Reflex:
      • An increase in blood pressure stretches the baroreceptors.
      • Impulses from the baroreceptors travel to the vasomotor center.
      • Signals from the vasomotor center inhibit sympathetic vasoconstrictor activity and increase vagal activity to the heart.
      • This results in vasodilation, decreased heart rate, and decreased blood pressure.
    • Baroreceptor system as a pressure buffer:
      • Prevents rapid changes in blood pressure.
      • Reduces minute-to-minute fluctuations in blood pressure.

    Denervated Baroreceptor System

    • After denervation, baroreceptors are less effective at regulating blood pressure.
    • This results in higher fluctuations in blood pressure.

    Chemoreceptors and Blood Pressure Regulation

    • Chemoreceptors: sensory receptors in the aortic arch and carotid bodies that detect changes in blood oxygen, carbon dioxide, and pH levels.
    • Chemoreceptor reflex: Responds to changes in blood gas levels to regulate blood pressure.
    • Mechanism of Chemoreceptor Reflex:
      • Decrease in blood oxygen, increase in carbon dioxide, or decrease in pH stimulates chemoreceptors.
      • Signals from the chemoreceptors travel to the vasomotor center.
      • The vasomotor center increases sympathetic vasoconstrictor activity, increasing blood pressure.

    CNS Ischemic Response

    • Mechanism:
      • Increase in intracranial pressure compresses cerebral vessels.
      • This triggers a CNS ischemic pressure response.
      • The vasomotor center increases sympathetic vasoconstrictor activity, increasing blood pressure.
      • This alleviates cerebral ischemia.
    • The CNS ischemic pressure response is a powerful mechanism to increase blood pressure in extreme cases of cerebral ischemia.

    Autonomic Nervous System and Circulation Regulation

    • The sympathetic nervous system plays a major role in circulatory regulation, increasing heart rate and contractility.
    • Sympathetic fibers directly connect to the heart, enhancing its pumping action.
    • Parasympathetic fibers influence cardiovascular function, mainly by controlling heart rate via the vagus nerve.
    • Parasympathetic stimulation decreases heart rate and contractility.

    Baroreceptors and Blood Pressure Regulation

    • Baroreceptors, located in the carotid sinuses and aortic arch, sense changes in arterial pressure.
    • Baroreceptor activation triggers a reflex that adjusts heart rate, vessel constriction, and blood pressure.
    • The baroreceptor reflex helps maintain stable arterial pressure during postural changes, preventing dizziness upon standing.

    Chemoreceptors and Arterial Pressure Regulation

    • Chemoreceptors, located in the carotid bodies and aortic bodies, sense changes in oxygen, carbon dioxide, and hydrogen ion levels.
    • Chemoreceptor activation triggers a reflex that modifies blood pressure, contributing to respiratory control.

    Atrial Reflexes and Volume Regulation

    • Atrial stretch receptors respond to increased atrial pressure, which often signifies increased blood volume.
    • Atrial reflex activation reduces renal sympathetic nerve activity, promoting diuresis and blood volume regulation.

    Nervous System Control Mechanisms and Oscillations

    • Oscillations in arterial pressure, known as vasomotor waves, can be caused by fluctuations in baroreceptor and chemoreceptor reflexes.
    • Delays in feedback responses can lead to oscillations in control systems, as seen in the example of an airplane's automatic pilot.

    Sympathetic Vasoconstriction

    • The sympathetic nervous system utilizes norepinephrine as the primary vasoconstrictor neurotransmitter.
    • Norepinephrine directly acts on alpha-adrenergic receptors in vascular smooth muscle, leading to vasoconstriction.
    • Adrenal medullae play a vital role in the sympathetic vasoconstrictor system.
    • Sympathetic impulses stimulate the adrenal medullae, causing the release of epinephrine and norepinephrine into the bloodstream.
    • These hormones act on all blood vessels, generally causing vasoconstriction.
    • Notably, epinephrine can also cause vasodilation in some tissues due to its stimulation of beta-adrenergic receptors.
    • A notable exception to vasoconstriction is the potential for sympathetic vasodilation in skeletal muscles during initial stages of exercise. This may be mediated by epinephrine or nitric oxide released from the vascular endothelium.
    • Emotional fainting (vasovagal syncope) involves activation of the muscle vasodilator system and vagal heart inhibition, resulting in a rapid drop in arterial pressure.
    • The drop in pressure reduces blood flow to the brain, leading to loss of consciousness, beginning with disturbing thoughts.

    Role of the Nervous System in Rapid Arterial Pressure Control

    • The nervous system is crucial for rapid increases in arterial pressure.
    • The sympathetic nervous system coordinates vasoconstriction and cardioacceleration.
    • This response involves simultaneous inhibition of parasympathetic vagal signals to the heart.
    • Three major changes occur simultaneously:
      • Systemic arterioles constrict, increasing total peripheral resistance and raising arterial pressure.
      • Veins (and other large vessels) are strongly constricted, further contributing to the pressure rise.
    • The rapid response of nervous control makes it a vital mechanism for immediate pressure regulation.
    • Within seconds of stimulation, arterial pressure can rise significantly.
    • Conversely, inhibiting nervous stimulation can quickly decrease arterial pressure by up to half within seconds.

    Pressure Buffer Function of the Baroreceptor Control System

    • The baroreceptor system opposes fluctuations in arterial pressure, acting as a pressure buffer.
    • The nerves connecting the baroreceptors to the central nervous system are referred to as “buffer nerves.”
    • Denervation of baroreceptors results in significantly increased variability in arterial pressure, demonstrating the importance of this system.
    • The system greatly reduces minute-to-minute variations in pressure.

    Baroreceptors and Long-Term Regulation

    • The significance of baroreceptors in long-term regulation of arterial pressure remains controversial.
    • Baroreceptors have been suggested to “reset” after 1 to 2 days to the prevailing pressure level, potentially reducing their long-term effectiveness.
    • Despite resetting, studies suggest a persistent contribution of baroreceptors to long-term pressure control.

    Chemoreceptor Reflex

    • The chemoreceptor reflex can also oscillate, often alongside the baroreceptor reflex.
    • The chemoreceptor reflex primarily influences vasomotor waves at low arterial pressures.
    • It is important at pressure ranges of 40 to 80 mm Hg, while baroreceptor control weakens.

    CNS Ischemic Pressure Control Mechanism

    • Oscillation of the CNS ischemic pressure control mechanism occurs during cerebral ischemia.
    • Cerebrospinal fluid pressure elevation causes compression of cerebral vessels, initiating a sympathetic surge to restore blood flow.
    • When pressure rises, the sympathetic system becomes inactive.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Guyton and Hall Physiology - Nervous Regulation of the Circulation PDF

    Description

    This quiz covers the structure and function of the vasomotor center, including its role in controlling vasoconstriction and vasodilation. It explores how sympathetic vasomotor tone affects blood pressure and the influence of higher brain centers on the vasomotor center's activity. Test your knowledge on these physiological processes.

    More Like This

    Neural Control of the Cardiovascular System Quiz
    21 questions

    Neural Control of the Cardiovascular System Quiz

    CleanestFriendship avatar
    CleanestFriendship
    Vasomotor Center and Autonomic Nervous System
    66 questions

    Vasomotor Center and Autonomic Nervous System

    InfluentialJasper4295 avatar
    InfluentialJasper4295
    Vasomotor Center Functions
    7 questions

    Vasomotor Center Functions

    StupendousImpressionism avatar
    StupendousImpressionism
    Vasomotor Center Flashcards
    8 questions

    Vasomotor Center Flashcards

    PrettyAnaphora avatar
    PrettyAnaphora
    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser