What is the primary role of blood in the human body?

The primary role of blood in the human body is to transport nutrients and oxygen. Blood serves as the main transportation system, delivering essential substances throughout the body. Oxygen, absorbed in the lungs, is carried to tissues and organs where it is needed for cellular respiration. Additionally, blood transports nutrients obtained from the digestive system, such as glucose, amino acids, vitamins, and minerals, to cells for energy, growth, and repair.

This complex fluid also plays a role in removing waste products, such as carbon dioxide and urea, which are transported to organs for excretion. The circulatory system, made up of the heart, blood vessels, and blood, ensures that these vital functions occur efficiently, supporting the overall health and functioning of the body.