Question

When you hold your breath which of the following gas changes in blood would first lead to the urge to breathe

• A. Falling $CO_{2}$ concentration
• B. Rising $CO_{2}$ concentration
• C. Rising $CO_{2}$ and falling$O_{2}$ concentration
• D. Falling $O_{2}$ concentration

Answer 1

Answer: (B)

Rising $CO_{2}$ concentration