Question

which of the following has the least influence on the rate of respiration?
carbon dioxide concentration in the blood
oxygen concentration in the blood
hydrogen ion concentration in the blood

Explanation:

The respiratory center in the brain is highly sensitive to changes in carbon dioxide concentration (which affects hydrogen ion concentration through \(CO_2 + H_2O
ightleftharpoons H_2CO_3
ightleftharpoons H^+ + HCO_3^-\)). Oxygen concentration has a relatively weaker direct influence on the basic respiratory rate under normal physiological conditions.

Answer:

oxygen concentration in the blood