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Q.

Chemoreceptors in the medulla of the brain are activated by

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a

low pCO2

b

high pH 

c

low pO2

d

high H+

answer is A.

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Detailed Solution

Chemoreceptors in the medulla of the brain are activated by high H+ and high pCO2. The role of oxygen in the regulation of respiratory rhythm is quite insignificant. Moreover, only peripheral chemoreceptors (carotid bodies and aortic bodies) are sensitive to changes in pO2. Central chemoreceptors in the medulla are not sensitive to changes in pO2.

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Chemoreceptors in the medulla of the brain are activated by