Blood Cells

What is Blood?

Blood cells are produced in bone marrow. Red cells, white cells and platelets are made in the marrow of bones, especially the vertebrae, ribs, hips, skull and sternum. These essential blood cells fight infection, carry oxygen and help control bleeding.

Plasma Carries Blood Cells

Plasma is a pale yellow mixture of water, proteins and salts. One of the functions of plasma is to act as a carrier for blood cells, nutrients, enzymes and hormones.

Red Cells Deliver Oxygen

Red cells are disc-shaped cells containing hemoglobin, which enables the cells to pick up and deliver oxygen to all parts of the body.

Photo Copyright:
Dennis Kunkel,
University of Hawaii

White Cells Defend The Body

White cells are the body's primary defense against infection. They can move out of the blood stream and reach tissues being invaded.

Platelets Help Control Bleeding

Platelets are small cells in the blood that control bleeding. They form clusters to plug small holes in blood vessels and assist in the clotting process.