What are the three types of blood cells and their functions as described in the chapter on Blood and Immunity?

The three types of blood cells are erythrocytes (red blood cells), leukocytes (white blood cells), and platelets (thrombocytes). Erythrocytes carry oxygen to cells, leukocytes are involved in immunity and protect against pathogens, and platelets are essential for blood clotting.

Erythrocytes, or red blood cells, are responsible for transporting oxygen bound to hemoglobin and also carry some carbon dioxide. Leukocytes, or white blood cells, play a crucial role in the immune system by protecting the body against pathogens and foreign materials. Platelets, also known as thrombocytes, are involved in hemostasis, forming a plug to initiate blood clotting.