What is the primary function of the hemoglobin molecule in the context of oxygen transport, in relation to the partial pressure of oxygen in the lungs and tissues?

A To facilitate the diffusion of oxygen from the lungs to the tissues ✓
B To regulate the pH of the blood by buffering excess hydrogen ions
C To maintain the structural integrity of red blood cells
D To scavenge reactive oxygen species and prevent oxidative damage

Explanation

Hemoglobin plays a crucial role in oxygen transport by binding to oxygen in the lungs and releasing it in the tissues, where the partial pressure of oxygen is lower.

Source

Guyton and Hall Textbook of Medical Physiology
Hematology Hematology: Hemoglobin and Oxygen Transport Hematology: Hemoglobin and Oxygen Transport Medium MEDICAL Confidence: high