Which component of blood is primarily responsible for transporting oxygen?

Red blood cells are primarily responsible for transporting oxygen throughout the body. They contain a protein called hemoglobin, which binds to oxygen in the lungs and carries it to tissues and organs that require it for metabolic processes. This binding is crucial for maintaining healthy cellular function, as oxygen is essential for energy production within cells. The unique structure of red blood cells, including their biconcave shape, maximizes their surface area for efficient gas exchange.

In contrast, the other components of blood each have distinct functions that do not include oxygen transport. Plasma is primarily a liquid medium that carries various substances, including nutrients, hormones, and waste products. Platelets play a critical role in blood clotting and preventing bleeding, while white blood cells are the key players in the immune response, helping the body fight infections and foreign invaders.