What is the role of hemoglobin's heme group in the transport of carbon dioxide?

A It binds to carbon dioxide, forming a carbaminohemoglobin complex ✓
B It facilitates the release of carbon dioxide from the blood
C It has no direct role in carbon dioxide transport
D It competes with oxygen for binding sites on the hemoglobin molecule

Explanation

The heme group in hemoglobin plays a crucial role in the transport of carbon dioxide. When carbon dioxide binds to the heme group, it forms a carbaminohemoglobin complex, which helps to transport carbon dioxide from the tissues to the lungs.

Source

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