Which of the following is a function of hemoglobin?

Hemoglobin plays a crucial role in the body primarily through its function in oxygen transport. It is a protein found in red blood cells, and its primary job is to carry oxygen from the lungs to the tissues and organs throughout the body. Hemoglobin binds to oxygen molecules due to its iron content, allowing for efficient oxygen delivery where it is needed for metabolic processes. This function is vital for cellular respiration, which produces energy necessary for various bodily functions.

Understanding the other options helps outline why they do not pertain to hemoglobin's primary role. Clot formation is primarily the function of platelets and clotting factors in the blood, which are involved in the coagulation process. White blood cell production occurs in the bone marrow and is related to the immune response rather than oxygen transport. Iron storage is primarily managed by molecules such as ferritin and hemosiderin in the body, rather than directly by hemoglobin itself. Thus, while iron is a component of hemoglobin, its storage is a separate function not carried out by hemoglobin.