Man has been studying the insides of the bodyforthe past2000 years. But they came to know what work the heart did only at the beginning of the 17th century.That is when the English physician William Harvey described the circulation of the blood.
Much earlier than that, the heart had been carefully dissected and described, yet no one knew its use.
The heart is a very efficient pump that moves blood through the body. The heart is a muscle that contracts and relaxes about seventy times a minute, for all the minutes of all theyears of your life. Each contraction and relaxation of the heart muscle is a heartbeat. You have more than 1,00,000 heartbeats every day. Each heartbeat pumps about two ounces of blood. This results in about 13,000 litres of blood being pumped each day.
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