Final answer:
A red blood cell is also known as an erythrocyte, which is distinct from leukocytes (white blood cells) and platelets, with the primary function of transporting oxygen.
Step-by-step explanation:
Another name for a red blood cell is an erythrocyte. Erythrocytes are specialized cells responsible for carrying oxygen to cells and removing carbon dioxide from them. This crucial transport of gases is facilitated by the protein called hemoglobin, which binds to oxygen and carbon dioxide. Mature red blood cells are characterized by their lack of a nucleus and organelles, which provides more space for hemoglobin, enhancing their oxygen-carrying capacity.
In contrast, a leukocyte is another name for a white blood cell, critical to the body's immune response, whereas platelets, also known as thrombocytes, are cell fragments that play an essential role in blood clotting. It is noteworthy that plasma does not refer to the cytoplasm within blood cells but rather to the liquid component of blood in which blood cells are suspended.