Figure 1.4. A molecule of methane. Carbon and hydrogen react to form methane by sharing electrons through a covalent bond.
In food and in components of the human body, energy resides in the chemical bonds of specific molecules. Bond formation and bond breaking are chemical reactions that involve the movement of electrons between atoms. These chemical reactions occur continuously in the body. When the chemical bonds of nutrients in the foods we eat are broken, energy is released. That energy is used by cells of the body to perform daily functions and tasks such as breathing, walking up a flight of steps, and studying for a test.
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