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 increased $CO _{2}$ is to decrease the affinity of haemoglobin for $O _{2}$. Thus due to Bohr's effect the $CO _{2}$ released in respiring tissue accelerates the delivery of oxygen by faster and deeper breathing.