Chapter 19: The Cardiovascular System: Blood Vessels

The heart is a muscular organ that is located on the left side of the chest between the waist and the shoulder. The heart first pumps blood out to lungs where it picks up oxygen. The oxygenated blood is then pumped to the body through a system of blood vessels: first through the arteries and then at the outer parts of the body through the capillaries. ................
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