Why do living things release energy?

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Mike the Venerable
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Why do living things release energy?

Post by Mike the Venerable » Tue Sep 25, 2007 12:29 am

I know living things need a constant supply of energy, and today I learned that living things give off energy in most of their chemical reactions. Why do living things do this since we need it?

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mith
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Post by mith » Tue Sep 25, 2007 2:05 am

growth
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

sara sabir
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.

Post by sara sabir » Tue Sep 25, 2007 5:55 am

energy is used to do work
have funz with empty gunz !!!

wbla3335
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Post by wbla3335 » Tue Sep 25, 2007 6:27 am

Also waste. Nothing is 100 percent efficient.

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MrMistery
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Post by MrMistery » Tue Sep 25, 2007 8:32 am

well we do need the energy. we need it for something. and we put it to use to do that something, we have to convert that chemical potential energy into mechanical energy etc. Also, every chemical reaction will give off some energy as heat, as no reaction is 100% efficient. actually, the efficiency of cellular respiration is only 38%. that is waay better than your car, which converts only 15% of the energy of the gasoline into movement of the wheels.
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

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