What is one function of blood in the human body?

One function of blood in the human body is its role in protection. Blood contains various components, including white blood cells and antibodies, that work together to defend the body against infections and foreign invaders. When pathogens, such as bacteria or viruses, enter the body, the immune cells in the blood can recognize and neutralize these threats, helping to maintain health and prevent disease. Additionally, components like platelets play a crucial role in clotting, which protects the body from excessive bleeding after injuries. This protective function is essential for overall health and plays a central role in the immune response.

In contrast, the transport of oxygen to the brain, while an essential aspect of blood’s function, is just one part of its broader transport role in the circulatory system. Support of body posture is primarily related to the musculoskeletal system rather than blood function. Similarly, digestion of nutrients involves the gastrointestinal system rather than blood, which has a more indirect role in nutrient transport after digestion occurs.