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  2. Protein metabolism - Wikipedia

    en.wikipedia.org/wiki/Protein_metabolism

    These amino acids are absorbed into the bloodstream to be transported to the liver and onward to the rest of the body. Absorbed amino acids are typically used to create functional proteins, but may also be used to create energy. [3] They can also be converted into glucose. [4] This glucose can then be converted to triglycerides and stored in ...

  3. Protein catabolism - Wikipedia

    en.wikipedia.org/wiki/Protein_catabolism

    Protein degradation differs from protein catabolism. Proteins are produced and destroyed routinely as part of the normal operations of the cell. Transcription factors, proteins that help regulate protein synthesis, are targets of such degradations. Their degradation is not a significant contributor to the energy needs of the cell. [3]

  4. Cellular respiration - Wikipedia

    en.wikipedia.org/wiki/Cellular_respiration

    An uncoupling protein known as thermogenin is expressed in some cell types and is a channel that can transport protons. When this protein is active in the inner membrane it short circuits the coupling between the electron transport chain and ATP synthesis. The potential energy from the proton gradient is not used to make ATP but generates heat.

  5. Metabolism - Wikipedia

    en.wikipedia.org/wiki/Metabolism

    Metabolism (/ m ə ˈ t æ b ə l ɪ z ə m /, from Greek: μεταβολή metabolē, "change") is the set of life-sustaining chemical reactions in organisms.The three main functions of metabolism are: the conversion of the energy in food to energy available to run cellular processes; the conversion of food to building blocks of proteins, lipids, nucleic acids, and some carbohydrates; and the ...

  6. Food energy - Wikipedia

    en.wikipedia.org/wiki/Food_energy

    In general, the efficiency of muscles is rather low: only 18 to 26% of the energy available from respiration is converted into mechanical energy. [15] This low efficiency is the result of about 40% efficiency of generating ATP from the respiration of food, losses in converting energy from ATP into mechanical work inside the muscle, and ...

  7. Protein (nutrient) - Wikipedia

    en.wikipedia.org/wiki/Protein_(nutrient)

    This value is known as the "crude protein" content. The use of correct conversion factors is heavily debated, specifically with the introduction of more plant-derived protein products. [20] However, on food labels the protein is calculated by the nitrogen multiplied by 6.25, because the average nitrogen content of proteins is about 16%.

  8. Cahill cycle - Wikipedia

    en.wikipedia.org/wiki/Cahill_cycle

    The Cahill cycle ultimately serves as a method of ridding the muscle tissue of the toxic ammonium ion, as well as indirectly providing glucose to energy-deprived muscle tissue. Under long periods of fasting, skeletal muscle can be degraded for use as an energy source to supplement the glucose being produced from the breakdown of glycogen.

  9. Phosphorylation - Wikipedia

    en.wikipedia.org/wiki/Phosphorylation

    Phosphorylation is essential to the processes of both anaerobic and aerobic respiration, which involve the production of adenosine triphosphate (ATP), the "high-energy" exchange medium in the cell. During aerobic respiration, ATP is synthesized in the mitochondrion by addition of a third phosphate group to adenosine diphosphate (ADP) in a ...