Short-Term BP Regulation
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Questions and Answers

Which system is primarily responsible for the rapid regulation of arterial pressure within seconds to minutes?

  • Renal body fluid mechanisms
  • Renin-angiotensin system
  • Baroreceptor reflexes (correct)
  • Vascular stress-relaxation
  • What is the main role of the parasympathetic nervous system on the heart according to the text?

  • Increasing heart rate
  • Decreasing heart rate (correct)
  • Increasing peripheral vascular resistance
  • Increasing contractility
  • Which part of the heart receives little to no parasympathetic innervation?

  • Atria
  • Ventricles (correct)
  • AV node
  • SA node
  • Where is the autonomic vasomotor center primarily located?

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

    What is the primary effect of sympathetic stimulation from the left stellate ganglia of the heart?

    <p>Increases contractility without changing heart rate</p> Signup and view all the answers

    What is the function of the vasoconstrictor area in the CNS vasomotor center?

    <p>Excite preganglionic sympathetic vasoconstrictor fibers</p> Signup and view all the answers

    What is the main mechanism of vasoconstriction?

    <p>Release of norepinephrine from postganglionic sympathetic nerves</p> Signup and view all the answers

    Which response accurately describes the effect of α1 receptors in the G-PROTEIN COUPLED MECHANISM for the sympathetic nervous system?

    <p>Stimulate IP3 and DAG production</p> Signup and view all the answers

    When is the normal tachycardic response most maximal after standing?

    <p>Around the 15th beat after standing</p> Signup and view all the answers

    What does the BP response to standing measure?

    <p>Change in blood pressure from supine to standing position</p> Signup and view all the answers

    Which beat is emphasized for measuring relative bradycardia after standing?

    <p>30th beat after standing</p> Signup and view all the answers

    What is the main mechanism through which impulses arising in the motor cortex contribute to vasodilation?

    <p>Release of epinephrine from vasodilator fibers</p> Signup and view all the answers

    Which area of the brain is NOT involved in modulating the activity of the vasomotor center?

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

    The rapid increase of blood pressure involves all of the following mechanisms EXCEPT:

    <p>Parasympathetic stimulation</p> Signup and view all the answers

    Which receptor type is responsible for responding to changes in blood pressure?

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

    Which area of the cerebral cortex plays a role in modulating the activity of the vasomotor center?

    <p>Primary motor cortex</p> Signup and view all the answers

    What is the main location where baroreceptors are predominantly found?

    <p>Aortic arch and carotid bifurcation</p> Signup and view all the answers

    A normal tachycardic response after standing is most marked around the 30th beat.

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

    Sympathetic fibers are distributed to SA node, AV node, atria, and ventricles via the ______.

    <p>stellate ganglia</p> Signup and view all the answers

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