A) carotid sinus
B) carotid bodies
C) surface of lungs
D) Both (a) and (b)
Correct Answer: B
Solution :
The increase in carbon-di-oxide concentration excites the chemoreceptors, which are mainly present in the carotid bodies, but few are also present in aortic bodies. Under normal conditions the effect of declining \[{{P}_{{{O}_{2}}}}\] on ventilation is slight and mostly limited to enhancing the sensitivity of central receptors to increased \[{{P}_{C{{O}_{2}}}}\]. Carotid sinus is the region, which has baroreceptors (spray type nerve endings that lie in the wall of arteries) in large quantity. It is the area, where wall of each internal carotid artery slightly above the carotid bifurcates. The baroreceptors assist in reflex blood pressure control.
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