Energy And Metabolism Essay

353 WordsJun 13, 20112 Pages
Anatomy and Physiology Energy Energy is the capacity for activity or a source of power, we need energy for metabolism. Metabolic processes are all physical and chemical processes. Examples: * Movement (muscle activity/contraction) * Active Transport – the cell wall moving molecules through that cannot not get through by themselves. * Phagocytosis in white blood cells – engulfing foreign bodies. * Production and secretion of substances – hormones, mucus, goblet cells. Metabolism Metabolism basically means tissue change, it is all processes by which the living body is maintained. It includes the processes by which energy is made available within the body. Catabolism – is a type of metabolic process. These metabolic processes involve breaking down large molecules into smaller molecules. Anabolism – is a type of metabolic process. It is the building of larger molecules from smaller molecules/atoms. To get energy fuel is required – fuel for the human body comes in the form of food items. The digestive system is involved in breaking down food items into smaller molecules (catabolism) for use in the body. Some are used in making energy available for the body. ATP – Adenosine Triphosphate Energy is stored for use in the body within ATP molecules. ATP is often described as the human bodies ‘energy current’. It is a nucleotide that contains ribose, which is a sugar unit, adenine, which is a base, and three attached phosphate groups. When energy is needed ATP splits a high energy bond, releasing a phosphate group, water and energy. As a result it becomes ADP (adenosine diphosphate). Adenine Ribose P P P The breakdown of digested foods – primarily glucose in the presence of oxygen releases energy, which is captured with water and a phosphate group to create ATP from

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