TMC Respiratory Care Boards Practice Exam 2025 – Full Test Prep Resource

Hemoglobin's primary function in the blood is to carry oxygen from the lungs to the tissues throughout the body. It is an iron-containing protein found in red blood cells, which binds effectively to oxygen molecules during respiration. Once oxygen is bound to hemoglobin, it is transported via the bloodstream and released into tissues where it is utilized for energy production and various cellular processes.

This transport mechanism is vital because oxygen is essential for aerobic metabolism, the process by which cells generate energy. Additionally, hemoglobin also assists in transporting carbon dioxide, a waste product of metabolism, back to the lungs for exhalation. This dual function plays a significant role in maintaining acid-base balance in the body as well.

While blood clotting, nutrient transport, and temperature regulation are important physiological processes, they are not the primary roles of hemoglobin. Blood clotting is mainly managed by platelets and clotting factors, nutrients are delivered by the plasma and other components of the circulatory system, and body temperature regulation involves skin and hypothalamic processes rather than hemoglobin function.