Which of these statements does NOT describe haemoglobin
A)Its presence keeps the blood PO₂ low and favours O₂ movement into the blood.
B)It can combine with O₂, CO₂, H⁺, and CO.
C)It unloads less O₂ in the presence of increased tissue acidity.
D)It unloads more O₂ when body temperature is higher.

Question

Quizplus · Accepted Answer

Haemoglobin unloads more O₂ in the presence of increased tissue acidity, not less. This is due to the Bohr effect, where lower pH (higher acidity) reduces haemoglobin's affinity for O₂, facilitating more O₂ release to tissues.

Which of These Statements Does NOT Describe Haemoglobin