Question

When there is a decrease in the concentration of oxygen in the blood, the rate of breathing 

(a) decreases

(b) increases

(c) does not change 

(d) first decreases, then increases

Answer 1

(b) increases

When oxygen level decreases in the blood, it results in Hypoxemia. It causes us to breathe more, increasing levels of oxygen in the blood.

Answer 2

(b) increases

When there is a decrease in the concentration of oxygen in the blood, the breathing rate increases. Breathing rate and breathing volume increase, the blood pressure increases, the heart rate increases, and kidney bicarbonate production ( in order to buffer the effects of blood acidosis), occur.