Neural control of CV quiz
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Questions and Answers

Which part of the nervous system controls the circulation?

  • Central Nervous system
  • Somatic Nervous system
  • Sympathetic Nervous system (correct)
  • Parasympathetic Nervous system

    • Where do sympathetic vasomotor nerve fibers leave the spinal cord?

  • Sacral spinal nerves
  • Coccygeal spinal nerves
  • Lumbar spinal nerves (correct)
  • Cervical spinal nerves

    • How do sympathetic vasomotor nerve fibers reach the circulation?

  • Through the parasympathetic nervous system
  • Through the central nervous system
  • Through the sympathetic chain (correct)
  • Through the somatic nervous system

    • What is the innervation of blood vessels?

    <p>All blood vessels are innervated</p> Signup and view all the answers

    How does sympathetic stimulation affect blood flow through the tissues?

    <p>It increases resistance to blood flow</p> Signup and view all the answers

    What role does sympathetic stimulation of large vessels, particularly veins, play in the regulation of heart pumping?

    <p>It decreases the volume of the veins</p> Signup and view all the answers

    Which part of the cardiovascular system is mainly innervated by specific sympathetic nerves?

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

    Which of the following is true about the sympathetic fibers' effect on the heart?

    <p>They increase heart rate</p> Signup and view all the answers

    What is the main circulatory effect of the parasympathetic nervous system?

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

    Where is the vasomotor center located?

    <p>In the brainstem</p> Signup and view all the answers

    What is the role of the vasoconstrictor area in the vasomotor center?

    <p>To excite preganglionic vasoconstrictor neurons</p> Signup and view all the answers

    What is the effect of sympathetic vasoconstrictor tone on blood vessels?

    <p>It maintains a partial state of constriction</p> Signup and view all the answers

    What happens when sympathetic nerve impulses are blocked?

    <p>Arterial pressure decreases</p> Signup and view all the answers

    What transmitters are involved in the control of heart activity by the vasomotor center?

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

    Which receptors detect simultaneous increases in pressure in the low-pressure areas of the circulation?

    <p>Low-pressure receptors in the atria</p> Signup and view all the answers

    What do the low-pressure receptors elicit in response to the increase in volume?

    <p>Baroreceptor reflexes</p> Signup and view all the answers

    What response occurs in the vasomotor center during CNS ischemia?

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

    What is the effect of the CNS ischemic response on systemic atrial pressure?

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

    What is the Cushing reaction?

    <p>Increased pressure of the cerebrospinal fluid around the brain</p> Signup and view all the answers

    What does the abdominal compression reflex help to increase?

    <p>Cardiac output</p> Signup and view all the answers

    What effect does inspiration have on the pressure in the thoracic cavity?

    <p>It becomes more negative</p> Signup and view all the answers

    What effect does the expansion of blood vessels in the chest during inspiration have on cardiac output and arterial pressure?

    <p>It increases cardiac output but decreases arterial pressure</p> Signup and view all the answers

    What is the cardiac index?

    <p>Cardiac output per square meter of body surface area</p> Signup and view all the answers

    Which of the following best explains the increase in arterial pressure described in the text?

    <p>All of the above</p> Signup and view all the answers

    What is the primary purpose of the arterial baroreceptor system?

    <p>To reduce minute by minute variation in arterial pressure</p> Signup and view all the answers

    Which of the following best describes the function of carotid and aortic chemoreceptors?

    <p>To respond to reduced arterial oxygen</p> Signup and view all the answers

    What initiates the baroreceptor reflex?

    <p>Stretch receptors in the walls of large systemic arteries</p> Signup and view all the answers

    What is the role of the atria and pulmonary arteries in regulating arterial pressure?

    <p>To respond to changes in blood volume</p> Signup and view all the answers

    What happens when the arterial pressure in the head and upper body tends to fall?

    <p>The baroreceptors transmit signals into the CNS to reduce arterial pressure</p> Signup and view all the answers

    What are the three major actions that explain the increase in arterial pressure?

    <p>Constriction of arterioles, constriction of venous and large vessel reservoirs, and direct stimulation of the heart</p> Signup and view all the answers

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