It also distributes secretions that are produced by your liver and endocrine glands, such as enzymes and hormones. The heart is made up of valves, chambers and muscle that requires an astonishing amount of oxygen. These blood vessels which are the arteries, arterioles, and the small capillaries carry blood from the heart to all the organs. Vessels that carry blood back to the heart are called veins. The walls of the capillaries are only one cell thick so nutrients and oxygen can transfer from the bloodstream to the cells and metabolic waste products can transfer to the bloodstream to be carried away.
Good circulation is one of the most important factors for maintaining optimum health.
The blood vessels must stay open enough to permit efficient blood to flow. Several factors can work against healthy circulation, and one important factor is the vasoconstriction brought about by such factors as stress and stimulants such as caffeine, certain drugs, and nicotine. Plaque can also reduce flexibility of the arterial walls and size of the opening. This is also necessary for the maintenance of healthy blood pressure. This scenario could require the heart to work much harder.