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The heart is a strong, hollow muscle in your chest. It is about the size of a closed fist and lies slightly left of the middle, between the lungs. Its job is to pump blood around the body.
The heart has four chambers and four one-way valves. The chambers fill with blood that comes in and then squeeze the blood out. The right side sends blood to the lungs for oxygen, while the left side sends oxygen-rich blood to the rest of the body. A heartbeat is the repeated squeeze and relax action of this muscle.
The heart has four chambers and four one-way valves. The chambers fill with blood that comes in and then squeeze the blood out. The right side sends blood to the lungs for oxygen, while the left side sends oxygen-rich blood to the rest of the body. A heartbeat is the repeated squeeze and relax action of this muscle.