First slide

Transport of Gases

Question

Hemoglobin’s affinity for oxygen

Moderate

A

decreases as blood pH increases
B

increases in exercising muscle tissue
C

decreases as blood pH decreases
D

is higher in maternal blood than in fetal blood

Solution

According to the Bohr effect, decreasing the pH in the blood decreases hemoglobin’s affinity for oxygen. During heavy exercise, when the muscles produce a lot of lactic acid, pH decreases which decreases haemoglobin’s affinity for oxygen. This facilitates the unloading of oxygen to tissues in need. Compared to maternal haemoglobin, foetal haemoglobin has more affinity for oxygen.

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