Blood circulation in human beings is double and complete. It is double because it has two circuits (general and pulmonary) and complete because the blood in the veins never mixes with the blood in the arteries. There are three kinds of blood vessels: arteries which go from the heart to the tissues, capillaries, minute vessels which are responsible for transporting the blood in the tissues, and veins that return the blood to the heart.
FUNCIONS:
1.Transports oxygen from the lungs to body tissues and transports the waste products of cellular metabolism and nutrients, hormones and enzymes.
2.Regulates blood clotting, body temperature, acid-base balance, water and electrolytes.
3.Protects against harmful organisms through white cells and antibodies.
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