Which component of blood is primarily responsible for transporting oxygen?

Red blood cells are primarily responsible for transporting oxygen in the blood. This is due to the presence of hemoglobin, a protein within these cells that binds to oxygen molecules in the lungs and releases them to tissues throughout the body. The unique structure of red blood cells, which are biconcave discs, increases their surface area, allowing for more efficient oxygen absorption and delivery.

While white blood cells play a significant role in the immune system and plasma serves as a carrier for nutrients, hormones, and waste, they are not involved in oxygen transport. Platelets, on the other hand, are crucial for blood clotting but have no function in the transport of oxygen. Therefore, red blood cells are the key component of blood that ensures oxygen reaches cells and tissues, facilitating cellular respiration and energy production.