The inner layer of the pericardium is attached to the heart muscle. The outer layer of the pericardium surrounds the roots of your heart’s major blood vessels and is attached by ligaments to your spinal column, diaphragm, and other parts of your body. A double-layered membrane called the pericardium surrounds your heart like a sac.
Your heart is located between your lungs in the middle of your chest, behind and slightly to the left of your breastbone (sternum). In fact, each day, the average heart beats 100,000 times, pumping about 2,000 gallons (7,571 liters) of blood. By the end of a long life, a person’s heart may have beat (expanded and contracted) more than 3.5 billion times.
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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