the human heart is divided into four chambers
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Being muscle, the chambers of the heart may respond to the extra burden of training by becoming hypertrophied, or thicker. This is usually not a problem as long as the cardiac "compliance" (or flexibility) of the chambers is maintained. Age and certain medical conditions, as diabetes and arteriosclerosis, may cause the chambers to become stiffer.
The valve does not close properly, which may lead to hypertrophy (enlargement) of the heart because blood will pool in the chambers.
Atrial Flutter. You may be thinking of atrial fibrillation, though.
You may not know this but as well as pumping, your heart also sucks blood back into its' chambers like a vaccum which is how your blood gets returned to your heart.
Deer hearts are found in deer; and some shops. Human hearts are typically only found in humans.