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The brain uses the most energy in the body.
food
All energy eventually turns to heat. No exceptions.
Energy is actually most evident when there is work. When an object or person moves it creates energy. An example of this would be pedaling a bicycle.
Electrical energy is used in most home appliances. However, you can't say it is used any more than kinetic energy, which you and all other objects use to move. Also, glucose in your body is chemical energy, which is also used. Potential energy would be the most used, if it counts, because every object that is not on the floor contains potential energy (it can fall and therefore the potential energy can be transferred into kinetic energy). Sound and light and thermal energy is also used a lot at home.
Breaking the bonds in a disaccharide.
The brain uses the most energy in the body.
food You body can also produce adrenaline when you are in "fight or flight" mode. In that case Adrenaline would be your body's main energy source.
ATP
oxygen
oxygen
energy, oxygen
Yes. X-rays have energy, and any x-rays absorbed by the human body would be converted to heat. Or most of that energy would be converted to heat, at any rate.
Most energy when a person is at rest is provided by fats. These are very important to the body's function.
Glycogen
its food
Although the body is able to use energy also from fat and protein, the most preffered nutrient for energy production in the body are carbohydrates.