Cellular components of blood include red corpuscles, platelets and five kinds of white corpuscles, according to SUNY Downstate Medical Center. The components are suspended in plasma. Red corpuscles, known as erythrocytes, and platelets, known as thrombocytes, perform most functions that occur within blood. Platelets play a key role in blood clotting.
SUNY Downstate Medical Center notes that the five types of white corpuscles, known as leukocytes, are monocytes, lymphocytes, eosinophils, neutrophils and basophils. Leukocytes are cells that move from small blood vessels into lymphatic or connective tissue and serve their functions both outside and inside the blood. White blood cells help the body fight off parasites and infection.
Plasma accounts for more than half of the blood fluid. It is made up mostly of water, along with glucose, hormones, carbon dioxide, blood cells, proteins and minerals. The primary protein in plasma, albumin, regulates blood pressure.
Blood delivers oxygen and nutrients to cells throughout the body in animals. It also removes waste products from cells. Blood circulates through blood vessels and is moved by the heart's pumping. Blood in arteries transports oxygen throughout the tissues of the body, while veins carry carbon dioxide to be exhaled through the lungs.