Humans get energy from the food they eat through a process called cellular respiration. During cellular respiration, glucose and other molecules from the food we eat are broken down in the presence of oxygen, producing energy in the form of ATP (adenosine triphosphate) and releasing carbon dioxide and water as waste products.

The process of cellular respiration occurs in the mitochondria, which are organelles found in most cells in the body. The breakdown of glucose in the presence of oxygen occurs in three stages: glycolysis, the Krebs cycle, and the electron transport chain.

During glycolysis, glucose is broken down into two molecules of pyruvate, producing a small amount of ATP and NADH. The pyruvate then enters the mitochondria, where it is further broken down during the Krebs cycle, producing more ATP and NADH. Finally, the NADH is used in the electron transport chain, where it generates a large amount of ATP and releases water as a waste product.

Overall, the process of cellular respiration allows humans to extract energy from the food they eat and use it for various bodily functions, such as movement, growth, and maintaining body temperature.
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