Describe the functioning of the heart
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Deoxygenated blood returns via veins to the venae cavae, re-entering the heart's right atrium. Of course, the heart is also a muscle, so it needs a fresh supply of oxygen and nutrients, too, Phillips said. The cardiovascular system circulates blood from the heart to the lungs and around the body via blood vessels
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The heart is the key organ in the circulatory system . As a hallow , muscular pump , it's main function is to propel blood through the body .It usually beat from 60-100 times per minute but can go much faster when necessary .It beats about 100,000 times a day more than 30 million times per year and about 2.5 billion times in a 70 year lifetime
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