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Q.

Chemoreceptors present in carotid and aortic arch are very sensitive to

(a) Increase in pCO2 in arterial blood

(b) Decrease in pO2 in venous blood

(c) Increase in pO2 in arterial blood

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a

Only (b)

b

both (b) and (c)

c

Only (a)

d

Only (c)

answer is A.

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Detailed Solution

Chemoreceptors present in carotid and aortic arch are very sensitive to increase in pCO2 in arterial blood. Role of oxygen in respiration is insignificant.

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