First slide

Transport of Gases

Question

Select the events that occur in the erythrocytes in the systemic capillaries.
A. Dissociation of $H_{2} {CO}_{3}$ into ${CO}_{2}$ and $H_{2} O$ .
B. Dissociation of $H_{2} {CO}_{3}$ into $H^{+}$ and ${HCO}_{3}^{-}$ .
C. Formation of $H_{2} {CO}_{3}$ from ${CO}_{2}$ and $H_{2} O$ .
D. Formation of $H_{2} {CO}_{3}$ from $H^{+}$ and ${HCO}_{3}^{-}$ .

Moderate

A

A and D
B

B and C
C

A and C
D

B and D

Solution

At the tissue, carbonic acid facilitates the formation of $H_{2} {CO}_{3}$ from ${CO}_{2}$ and $H_{2} O$ . $H_{2} {CO}_{3}$ dissociates into $H^{+}$ and ${HCO}_{3}^{-}$ . About 70% of ${CO}_{2}$ is transported from the tissues to the lungs as ${HCO}_{3}^{-}$ . At the lungs, oxygen binds to haemoglobin, forming ${HbO}_{2}$ , which is more acidic and unloads $H^{+}$ . This $H^{+}$ binds to ${HCO}_{3}^{-}$ to form $H_{2} {CO}_{3}$ , which dissociates ${CO}_{2}$ and $H_{2} O$ , and ${CO}_{2}$ is exhaled.

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