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5. A wave of expansion passing through the arteries is called

Answer»

1. There arethree typesof livingcellsinblood: redblood cells(or erythrocytes), whiteblood cells(or leukocytes) and platelets (or thrombocytes).

2. The RBCs carry oxygen from thelungs.

The WBCs help to fight infection, and platelets are parts of cells that the bodyuses for clotting. All blood cells are produced in the bone marrow.

The normal plateletcountis 150,000-350,000 per microliter of blood, but since platelets are so small, they make up just a tiny fraction of the blood volume. The principal function of platelets is to prevent bleeding. Red blood cells are the most numerous bloodcell, about 5,000,000 per microliter.

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