It is accurate to say that the heart beats more slowly while we sleep, giving the body less oxygen.
The diameter of a fist, you heart is located in the center of your chest, leaning slightly towards the left. This is the muscle that your cardiovascular system depends on to circulate blood around the body while your heart beats.
The sternum, or chest cavity, houses the heart and lungs. Blood oxygenated in the lungs following traveling thru the body via heart. The circulation is subsequently recirculated, which then distributes the newly oxygenated blood throughout the body.
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