An example is muscle contraction. When muscles contract the chemical energy of ATP undergoes another transformation resulting in the kinetic energy of muscle motion. All of the energy transformations occurring during photosynthesis and respiration obey the laws of thermodynamics. How Cells Make ATP 1. Cellular respiration consists of glycolysis, Krebs cycle and the electron transport chain and oxidative phosphorylation.
Glycolysis occurs in the cytosol, all other reactions occur in the mitochondria.
For each molecule of glucose degraded to CO2 and H2O in the process, about 36 molecules of ATP are made. A small amount of ATP is formed by substrate-level phosphorylation in glycolysis and the Krebs cycle. A phosphate group is transferred to ADP from phosphorylated organic compounds produced as intermediates in the catabolism of glucose. Oxidative phosphorylation produces ATP by a chemiosmotic mechanism. Both photosynthesis and respiration are complex, coupled series or redox reactions.