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Carbohydrates, more specifically: glucose
Cells do not choose their source of energy.
They use the wrong kind of energy and they use too much of it. That's why other batteries are way better. One, they hardly use 6% as much as chemical fuel cells. Two, the chemical fuel cells pollute the air too.
Chemical energy
fuel cells converts chemical energy to eletrical power and the only waste product for fuel cells is water
Mitochondira generate a cells fuel, called adenosine triphosphate (ATP), which is used as a source of chemical energy, which you need because muscle cells are so active.
A Neuron is a nerve cell. Glucose is the major fuel source for all cells, It is turned into ATP by aerobic respiration. Aerobic respiration occurs within the mitochondria of cells. ATP is the form of energy stored and used by cells.
there isn't an actual chemical to start fire. all you need is an ignition source, oxygen, and a fuel source (such as wood)
Carbon and hydrogen
hydrogen
converts the chemical energy of a fuel and an oxzidizing into electricity.
ATP