What component of the blood is primarily responsible for transporting oxygen?

The primary component of the blood responsible for transporting oxygen is red blood cells. These cells contain a protein called hemoglobin, which binds to oxygen molecules in the lungs. When red blood cells circulate through the bloodstream, hemoglobin releases oxygen to the body's tissues and organs, allowing them to function properly. This process is essential for maintaining the metabolic functions necessary for life.

In contrast, white blood cells are primarily involved in the immune response, helping to defend the body against infections and foreign substances. Platelets play a crucial role in blood clotting and preventing excessive bleeding when injuries occur. Plasma, which is the liquid component of blood, carries nutrients, hormones, and waste products, but it does not have a direct role in oxygen transport. Therefore, red blood cells are the key players in ensuring efficient delivery of oxygen throughout the body.