Your heart is located between your lungs in the middle of your chest, behind and slightly to the left of your breastbone. A double-layered membrane called the pericardium surrounds your heart like a sac. The heart weighs between 7 and 15 ounces (200 to 425 grams) and is a little larger than the size of your fist.
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Image: heart anatomy - posterior surface view with labels
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