What type of blood cells are responsible for transporting oxygen throughout the body?

Erythrocytes, commonly known as red blood cells, are the key blood cells 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. The structure of erythrocytes, which are biconcave and lack a nucleus in their mature form, allows for a larger surface area that facilitates efficient gas exchange.

In contrast, leukocytes, or white blood cells, play a crucial role in the immune system, fighting infections and foreign substances. Platelets are primarily involved in blood clotting and preventing bleeding, while neutrophils, a type of leukocyte, are specifically designed to combat infections. Thus, it is the unique structure and function of erythrocytes that make them essential for oxygen transport in the bloodstream.