A heart is one of the most important organs in your body, so it's a good idea to understand what makes your ticker tick. This vital structure beats 100,000 times a day. About eight pints (five liters) of blood move continuously through your circulatory system via blood vessels, which deliver nutrients and oxygen to every part of your body and carry away carbon dioxide and waste. Together, your heart and circulatory system make sure your organs have the blood they need to function optimally.
It consists of three main structures. The pericardium is the thin outer lining surrounding and protecting the organ. The myocardium is the thick muscular middle layer that pumps blood when it contracts and squeezes. Finally, the endocardium is the thin, smooth membrane lining the chambers of the heart that makes up the surface of the valves.
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