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A combination of things causes the heart to pump and several conditions can interfere with the heart pumping. However, the left ventricle is the workhorse of the heart. It is said, in figuring comparisons, the heart can shove a steamship up on the beach it is so strong.

We have 3 electrical nodes (to simplify explanation) in the heart, one at the top, one at the bottom, one in the middle. Electrical impulses travel from one to the other causing the heart impulses. It is said heart muscle will beat on its own even in a lab setting it is so "electrical". As the heart depolarizes from these nodes it "beats".

We all have a natural "pacemaker", located in the right atrial wall of the heart. This "pacemaker" sets the heart's "sinus rhythm" of 70-80 bpm. Heart muscle is different from any other in the body.

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14y ago

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