After An Organism Uses Energy, What Happens To It?

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The first law of thermodynamics states that energy cannot be created or destroyed but it can only change from one form to another. In an organism, energy enters from his food in the form of complex molecules for example starch. This starch is then broken down into many smaller units that would have the same amount of energy in total. This molecule is glucose which is then used to produce energy. The energy produced can change into work energy if a person walks or lifts a load etc.
When energy is used up by the body and it is no longer required, it is released usually in the form of heat. That is why homeostasis is so important in the water. One aspect of homeostasis is control of body temperature. If too much heat energy is present in the body and we are feeling too warm, the body dissipates this heat, usually by perspiration and increasing blood flow to skin surface. If on the other hand, it is very cold, then the body tries to harvest as much of this heat energy as possible to keep the body warm. Goosebumps trap heat closer to the skin and skin blood vessels constrict to reduce blood flow here which in turn prevents much heat to be lost.
So what the body does with the energy after using it is determined by what its need of the hour is!

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