First slide

Mechanism of Breathing

Question

Inadequate exhalation of ${CO}_{2}$ causes

Moderate

A

decrease in blood pH
B

decreased excretion of $H^{+}$ by kidneys
C

decreased breathing rate
D

increase in blood pH

Solution

Any condition that decreases the movement of ${CO}_{2}$ from the blood to the alveoli of the lungs to the atmosphere causes a decrease in blood pH due to a build-up of $H^{+}$ .
${CO}_{2} + H_{2} O \overset{}{\to} H_{2} {CO}_{3} \overset{}{\to} H^{+} + {HCO}_{3}^{-}$

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