Breathing and Exchange of GasesHard

Question

Respiratory centre of brain is stimulated by

Options

A.Carbon dioxide content in venous blood
B.Carbon dioxide content in arterial blood
C.Oxygen content in venous blood
D.Oxygen content in arterial blood

Solution

In healthy individuals the presence of elevated carbon dioxide levels in the blood is the stimulant that the RC responds to in order to signal the respiratory muscles to breathe. Chemoreceptors found in carotid bodies and aortic bodies are responsible for detecting decrease in blood pH by this carbon dioxide.

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