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Old 05-05-2005, 10:13 PM   #1
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The Heart never stops beating.
this is an off the wall question but i twas just thinking about it. how in the world can your heart beat for years on end? think about it. Im 25 and my heart has been beating 25 years straight non stop. If we move are arms up and down they get tired till we cant move them anymore. does the heart ever get tired? how does this work?

 
Old 05-06-2005, 03:45 AM   #2
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Re: The Heart never stops beating.
The heart has electrical nodes in it that keep it beating. Isn't it an amazing organ. The heart gets tired when it needs to push blood through narrow blood vessels that have plaque build-up in them, thats why you want to keep your cholesterol in a safe range, monitor your blood pressure, watch your weight and exercise. Anything that constricts your blood vessels such as smoking and too much caffiene is also bad. Some cardiac problems can also be heridatary.

 
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Old 05-06-2005, 04:44 PM   #3
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Re: The Heart never stops beating.
the heart is made of special muscle cells, cardiac muscle

it is myogenic i.e. the heart will still beat even if you take it out. =) interesting?

the heart cells cannot regenerate if they are damaged but they can increase their size e.g. when you exercise, the heart grows =) interesting? =P

 
Old 05-06-2005, 08:21 PM   #4
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Re: The Heart never stops beating.
ya tghe heart is pretty amazing. just thinks its wild how it can beat for so long and u not have pains. its very amazing actually.

 
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