Question

Which of the statements below about hemoglobin's oxygen binding is incorrect?

Option 1: Hemoglobin releases oxygen in tissues with low oxygen concentration
Option 2: Hemoglobin binds oxygen in the lungs
Option 3: Hemoglobin is composed of four subunits
Option 4: Hemoglobin binds carbon dioxide in the lungs

Answer 1

Hemoglobin does not bind carbon dioxide in the lungs.

Step-by-step explanation:

The incorrect statement about hemoglobin's oxygen binding is Option 4: Hemoglobin binds carbon dioxide in the lungs. Hemoglobin actually binds oxygen in the lungs and releases it in tissues with low oxygen concentration. Hemoglobin's primary function is to carry oxygen to the body tissues, not to bind carbon dioxide. Carbon dioxide is transported in the blood primarily as bicarbonate ion and dissolved CO2.