What are erythrocytes commonly known as?

Erythrocytes are commonly known as red blood cells. This designation comes from their primary function and characteristic appearance; they are responsible for transporting oxygen from the lungs to the tissues and returning carbon dioxide from the tissues back to the lungs. The red color of these cells is due to the presence of hemoglobin, a protein that binds oxygen.

In contrast, other options represent different components of the blood. White blood cells are involved in immune responses, platelets play a crucial role in blood clotting, and plasma cells are specialized white blood cells that produce antibodies. Understanding the distinct roles and characteristics of these cells is important in comprehending the overall function of the circulatory and immune systems.