What are erythrocytes commonly known as?

Erythrocytes are commonly known as red blood cells because they are the type of cells in the blood responsible for transporting oxygen from the lungs to the rest of the body and returning carbon dioxide from the body back to the lungs. The presence of hemoglobin, a red protein that binds to oxygen, is what gives erythrocytes their characteristic red color. Their primary role is essential for maintaining the body's overall metabolism and ensuring that cells receive the oxygen needed for energy production.

In contrast, white blood cells play a crucial role in the immune system, helping the body fight infections. Platelets are fragments of cells that are vital for blood clotting. Plasma cells are a type of white blood cell involved in producing antibodies. Each of these components has distinct functions, which highlights why erythrocytes specifically refer to red blood cells.