Question

When $CO_2$ concentration in blood increases breathing becomes

• A. shallower and slow
• B. there is no effect on breathing
• C. slow and deep
• D. faster and deeper

Answer 1

Answer: (D)

faster and deeper

Answer 2

When $CO_2$ concentration in blood increases, breathing becomes faster and deeper. The effect of rising $CO_2$ concentration is due to decrease in affinity of $Hb$ for $O_2$. Thus, the $CO_2$ released in the tissues accelerates the delivery of $O_2$ (called Bohr effect), due to which breathing becomes faster and deeper.