Liver disease or smoking is a contribute to discoloration of heart muscles
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The blood flows to and from the heart primarily because of the relaxing and contracting of the heart muscle. Muscles throughout the body also exert pressure on blood vessels to literally push blood to the heart. the relaxing and contracting of the heart muscle
Papillary muscles are found in the heart's ventricles. They control the AV valves.
When used with a heart attack patient who is suffering form arrhythmia or who's heart has stopped completely. The defibrillator causes the muscles of the heart contract, (hopefully) and to return to its normal rhythmic pattern.
No because your heart is a muscle so there are no muscles within the heart.
The structure of the leg muscle is similar to the heart muscle in their makeup. There are studies that have shown that leg muscles can be injected into the heart.