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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.

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1. What are the Main Structures of the Heart?

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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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other health-care professional.