19 Questions
Which system is primarily responsible for the rapid regulation of arterial pressure within seconds to minutes?
Baroreceptor reflexes
What is the main role of the parasympathetic nervous system on the heart according to the text?
Decreasing heart rate
Which part of the heart receives little to no parasympathetic innervation?
Ventricles
Where is the autonomic vasomotor center primarily located?
Medulla/pons
What is the primary effect of sympathetic stimulation from the left stellate ganglia of the heart?
Increases contractility without changing heart rate
What is the function of the vasoconstrictor area in the CNS vasomotor center?
Excite preganglionic sympathetic vasoconstrictor fibers
What is the main mechanism of vasoconstriction?
Release of norepinephrine from postganglionic sympathetic nerves
Which response accurately describes the effect of α1 receptors in the G-PROTEIN COUPLED MECHANISM for the sympathetic nervous system?
Stimulate IP3 and DAG production
When is the normal tachycardic response most maximal after standing?
Around the 15th beat after standing
What does the BP response to standing measure?
Change in blood pressure from supine to standing position
Which beat is emphasized for measuring relative bradycardia after standing?
30th beat after standing
What is the main mechanism through which impulses arising in the motor cortex contribute to vasodilation?
Release of epinephrine from vasodilator fibers
Which area of the brain is NOT involved in modulating the activity of the vasomotor center?
Cerebellum
The rapid increase of blood pressure involves all of the following mechanisms EXCEPT:
Parasympathetic stimulation
Which receptor type is responsible for responding to changes in blood pressure?
Baroreceptors
Which area of the cerebral cortex plays a role in modulating the activity of the vasomotor center?
Primary motor cortex
What is the main location where baroreceptors are predominantly found?
Aortic arch and carotid bifurcation
A normal tachycardic response after standing is most marked around the 30th beat.
False
Sympathetic fibers are distributed to SA node, AV node, atria, and ventricles via the ______.
stellate ganglia
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