A chemosensitive area situated in the medulla of the brain is highly sensitive to CO₂ and hydrogen ions. It mainly helps regulate

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digestion

excretion

respiration

reproduction

answer is C.

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Detailed Solution

A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to CO₂ and hydrogen ions. Increase in these substances can activate this centre, which in turn can signal the rhythm centre to make necessary adjustments in the respiratory process by which these substances can be eliminated.

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