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The Heart (Function (The left main coronary artery, on one side of the…
The Heart
Function
The left main coronary artery, on one side of the aorta, branches into the left anterior descending artery and the left circumflex artery
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In the systemic circuit, oxygenated blood leaves the body via the left ventricle to the aorta, and from there enters the arteries and capillaries where it supplies the body's tissues with oxygen.
Blockage of any of these arteries can cause a heart attack, or damage to the muscle of the heart
In the pulmonary circuit, deoxygenated blood leaves the right ventricle of the heart via the pulmonary artery and travels to the lungs, then returns as oxygenated blood to the left atrium of the heart via the pulmonary vein.
A heart attack is distinct from cardiac arrest, which is a sudden loss of heart function that usually occurs as a result of electrical disturbances of the heart rhythm
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Facts
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The heart beats about 100,000 times per day (about 3 billion beats in a lifetime)
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The heart weighs between about 10 to 12 ounces (280 to 340 grams) in men and 8 to 10 ounces (230 to 280 grams) in women
Newborns' hearts beat faster than adult hearts, about 70 to 190 beats per minute
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The heart is located in the center of the chest, usually pointing slightly left
Anatomy
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The physiology of the heart comes down to "structure, electricity and plumbing"
A double-walled sac called the pericardium encases the heart, which serves to protect the heart and anchor it inside the chest
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