Which component of blood is primarily responsible for gas transport?

Erythrocytes, or red blood cells, are primarily responsible for gas transport in the bloodstream. They contain hemoglobin, a protein that binds to oxygen in the lungs and carries it to tissues throughout the body. Hemoglobin also facilitates the transport of carbon dioxide from the body's tissues back to the lungs for exhalation. The unique biconcave shape of erythrocytes increases their surface area, enhancing their ability to absorb and release gases efficiently.

Other components of blood, like leukocytes (white blood cells), are important for immune function but do not participate in gas exchange. Plasma, the liquid portion of blood, carries nutrients, hormones, and waste products, but it does not play a direct role in gas transport. Thrombocytes, or platelets, are crucial for blood clotting and wound healing but are also not involved in gas transport. Thus, erythrocytes are the key players in the critical function of transporting gases throughout the circulatory system.