Since our heart is a muscle, how come it beats all our life and doesn't get tired?

24 minutes ago, m_m said:

Since our heart is a muscle, how come it beats all our life and doesn't get tired?

When this happens, there is a stroke or heart attack or hypoxia of internal organs.

 

The heart supplies oxygen to itself, the brain, all organs and tissues. Without oxygen they die. The procedure of self-destruction of the cell is activated.

Bypassing the self-destruction procedure is difficult/clumsy.

 

Edited January 19Jan 19 by Sensei

Just now, Sensei said:

The heart supplies oxygen to itself, the brain, all organs and tissues. Without oxygen they die. The procedure of self-destruction of the cell is activated.

Thank you. You explained results of the heartbeat, and i asked about the reasons.

1 hour ago, m_m said:

Thank you. You explained results of the heartbeat, and i asked about the reasons.

No, I'm pretty sure Sensei just denied your premise, in the part you didn't quote. The heart DOES get tired, with catastrophic results.

Just now, Phi for All said:

The heart DOES get tired, with catastrophic results.

When the heart is tired it is death.

3 minutes ago, m_m said:

When the heart is tired it is death.

False. Hearts can be tired decades before death 

Edited January 19Jan 19 by iNow

2 minutes ago, m_m said:

When the heart is tired it is death.

Except when it's not. 

The heart isn't like skeletal muscles. It's not attached to the bones and cardiac cells are powered differently than other muscles. 

Do you have a point to make that isn't rooted in misconceptions?

To expand on Phi’s answer

https://www.sciencefocus.com/the-human-body/heart-muscle-tired

“the heart is made of cardiac muscle, consisting of special cells called cardiomyocytes.Unlike other muscle cells in the body, cardiomyocytes are highly resistant to fatigue.

cardiomyocytes are primarily powered by mitochondria (the energy house of the cell), similar to your other muscles. However, cardiomyocytes have as much as10 timesthe density of mitochondria, skyrocketing their energy output.”