Blood is a body fluid in the circulatory system of humans and other vertebrates that delivers necessary substances such as nutrients and oxygen to the cells, and transports metabolic waste products away … Blood donation near you at a donor center or on the big red bus. Give blood or platelets today to help save lives tomorrow.

The main job of red blood cells, or erythrocytes, is to carry oxygen from the lungs to the body tissues and carbon dioxide as a waste product, away from the tissues and back to the lungs. Blood is a specialized fluid that constantly flows throughout your body. It’s made of plasma, red blood cells, white blood cells and platelets. It has four main components: Plasma, red blood cells, white blood cells, and platelets. The blood that runs through the veins, arteries, and capillaries is known as whole bloodâ€a mixture of about 55% … Blood types are determined by the presence or absence of certain antigens †substances that can trigger an immune response if they are foreign to the body.

Plasma, red blood cells, white blood cells, and platelets. The blood that runs through the veins, arteries, and capillaries is known as whole bloodâ€a mixture of about 55% … Blood types are determined by the presence or absence of certain antigens †substances that can trigger an immune response if they are foreign to the body. Since some antigens can trigger a …