From where kinetic energy comes for human body motion?

I know that brain is the trigger for muscles to move but where movement energy comes from?
It's like a car. Start key is the trigger but energy comes from battery. Where is the battery in human body?
Answer:
The sourcce of energy for anybody to move, think, or perform any kind of action- whether it is physical or even thinking is the wonderful molecule called ATP- or , Adenosine TriPhosphate. This molecule consists of a base (adenosine) that is attached to a ribose sugar, and three other phosphate groups, hence the name tri-phosphate. Now, when ever the brain detects the intention of motion, or the human preceives that he/she must start moving, as happens in contents or in danger, the brain instructs the body to start breaking down this molecule, ATP, but not completely, only cleaving one phosphate group, so the adenosine triphosphate, is now called adenosine di-phosphate, and a dettached group of phosphate. This cleaving is eesential for body in motion, or brain in thinking since in that link, between the one phosphate group and the rest of the ATP molecule there is a huge energy storage, that can only be "unleashed" if you break that bond. Now, how can you get ATP? this ATP is like your available currency that you use at the grocery store to buy food; but first you must go to the bank and pull out some money. The body does the same thing, only with glucose, starch and fat storage that is dispersed across your body. These storages (bank accounts) start to break down when you start exercising or moving for a long time period thereby producing even more ATP molecules ready to be used by the body. This is the reason why runners tend to drink or ingest really sweet substances since they have a lot of glucose, hence a lot of ATP available. Another reason is, as you exercise more the body starts breaking down the fat storages in the body in order to obtain the necessary amount of ATP to sustain your physical activity, that is why you lose weight when you exercise. I hope it helped. Good Luck.

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Chemical reactions that happen in cells with food as a fuel source--%26gt;

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Electrical energy from the brain to the muscles. The brain has chemicals that create the electricity.

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Muscle cells make ATP from energy released from the foods we eat. The structure of the molecule of ATP has potential energy in it, mainly in its phosphate bond. This molecule interacts with protein molecules in the muscle tissues. (Not sure, but I think the names of the two main proteins are actin and myosin). As the ATP breaks down, the energy of the bond causes movement of these proteins in a way that makes one protein pull on the other in an oar-like fashion. With the collaboration of a multitude of these proteins, it causes the entire muscle tissue to contract or shorten. As the opposite ends of the muscle are connected to different bones, the contraction of the muscle pulls these bones closer together to cause movement, and hence kinetic energy.

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