All are true about baroreceptors, expect
?
a) Stimulated when BP decreases
b) Afferents are through sino-aortic nerves
c) Stimulation causes increased vagal discharge
d) Stimulate nucleus ambiguous
Correct Answer - A
Ans. A. Stimulated when BP decreases
Baroreceptors are highly sensitive to any change in mean Bp.
When BP rises, baroreceptors are stimulated and their aferent
(through sinoaortic nerves) stimulate nucleus of tractus solitarus
(MIS) which inhibits the pressor area of vasomoter center i.e. RVLM.
This results in decreased sympathetic outflow and, as a result
vasodilatation.
Bp comes down