10 Questions
What is the main function of the peripheral chemoreceptors in regulating blood pressure?
To increase cardiac output and vasoconstriction in response to hypoxia and acidosis
How does the capillary fluid shift mechanism help regulate blood pressure?
It can both increase and decrease blood pressure by altering capillary hydrostatic pressure and fluid shifts
What is the nervous connection between the peripheral chemoreceptors and the regulation of blood pressure?
The aortic bodies are innervated by the 10th nerve, and the carotid bodies are innervated by the 9th nerve
What is the initial response of the peripheral chemoreceptors to a drop in blood pressure due to hemorrhage?
They stimulate vasoconstriction and increase cardiac output to raise blood pressure
How does the capillary fluid shift mechanism help regulate blood pressure during changes in blood volume?
It can both increase and decrease blood pressure by altering capillary hydrostatic pressure and fluid shifts
What is the primary function of the arterial baroreceptors?
To send inhibitory impulses to the vasoconstrictor center during periods of high blood pressure
Which cranial nerve carries the afferent impulses from the carotid sinus baroreceptors?
Glossopharyngeal nerve (9th cranial nerve)
What is the effect of decreased arterial blood pressure on the pressor area of the brainstem?
The pressor area becomes released from inhibition, leading to increased heart rate, stroke volume, and vasoconstriction
What is the relationship between arterial blood pressure and the rate of discharge from the arterial baroreceptors?
The rate of discharge is maximal at 180 mmHg, and does not increase further with higher pressures
What is the primary reflex pathway activated by the carotid sinus baroreceptors in response to increased arterial blood pressure?
Increased inhibition of the vasoconstrictor center
Test your knowledge on the modification of activity centers in the cardiovascular system by afferents from arterial baroreceptors located in the aortic arch and carotid sinus. Learn about the types of mechanoreceptors, nervous connections, stimuli, and more discussed in Professor Dr. Heba Shawky's lecture.
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