The heart is a muscle in your chest made up of 4 chambers.
1. Right atrium
2. Left atrium
3. Right ventricle
4. Left ventricle
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The four chambers of your heart are made of a special type of muscle called myocardium. The myocardium does the main pumping work: It relaxes to fill with blood and then squeezes (contracts) to pump the blood. "Contractility" describes how well the heart muscle squeezes
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