Question

Respiratory centre in the brain which regulates the process of respiration is extremely sensitive to blood concentration of

• A. O${}_2$
• B. CO${}_2$
• C. Hydrogencarbonate
• D. Oxyhaemoglobin

Answer 1

Answer: (B)

CO${}_2$

Respiratory centres are located in the medulla oblongata and pons in the brain. They are extremely sensitive to blood concentration of carbon dioxide and work in response to reduction or elevation in the level of CO${}_2$ in the body and hence help in regulation of respiration.

So the correct answer is 'CO${}_2$'.