What is the primary function of blood?

The primary function of blood is to carry materials to and from bodily tissues. Blood serves as a vital transportation system within the body, delivering oxygen from the lungs to cells throughout the body and returning carbon dioxide to the lungs for exhalation. Additionally, it transports nutrients absorbed from the digestive tract to cells, hormones produced by glands to target organs, and waste products to the kidneys and liver for processing and elimination. This intricate network ensures that all body cells receive the substances they require for metabolism while removing waste, thereby maintaining homeostasis and facilitating overall bodily function.

While blood does have other important functions, such as regulating temperature and acting in hormone transport, the central role it plays in the transportation of various materials to and from tissues underscores its significance in sustaining life and promoting health.