What makes the heart beat? Electricity.

According to the American Heart Association the heart beats an average of 100,000 times a day -- anywhere from 60 to 100 beats a minute -- which adds up to more than 2.5 billion beats by the time we turn 70-years-old.

>>8981009
it's muscle contractions

>>8981009
>Anyone with knowledge care to explain how it is possible for a heart to beat for a 100 years.

Teenagers always get this wrong. Do you even know what keeps it beating in the first place?

Read up on muscle function and neural signaling. The heart is just a fancy twisted muscle.

>>8981032
>Do you even know what keeps it beating in the first place?
No, hence the question.

>>8981009
Well, the main reason for it: the heart has not experienced too much hypoxia and cellular damage during lifetime.

There are many factors to this.
1. Low genetic tendency for cardiovascular diseases. If you get shitty genes from your parents, you have to compensate with nutrition and healthy lifestyle if you wish to keep your body operational a long time.
2. Enough physical work. It increases the stroke volume of heart and reduces the heart rate substantially. More blood flow with less burden.
3. Healthy nutrition and habits that decrease the risk for high blood pressure, diabetes, atherosclerosis etc. which may lead to cardiac cell damage.

>>8981078
Thanks! Great answer, really.