Energy is necessary for muscular activity and movement however, energy is also necessary to circulate blood and lymph and tissue fluid throughout the body; for breathing and taking in oxygen; for making new cells for carrying out growth and repair. Also, it can be used to transmit nerve impulses so that we can respond to changes in the environment such as temperature.
ATP is the only source of energy that the body can use though there are several other types of energy that are chemical, heat, light, sound and nuclear. Energy can be stored as glucose and the process of turning this glucose into ATP is called cellular respiration.
There are three stages of cellular respiration and these are, glycolysis, the krebs cycle and the electron transport chain (ETC). Glycolysis is the first step in a biomedical pathway of respiration. It occurs in the cells cytoplasm and no oxygen is needed for this. The next stage is the Krebs cycle, this takes place in the mitochondrial matrix and is a cycle of reactions. One ATP is created for every complete cycle and oxygen is needed for this. The last stage of cellular respiration is ETC, this also occurs in the mitochondrial matrix and the molecules are passed next along the ETC. Oxygen is also needed for this. Cellular respiration is an example of an catabolic reaction as it is the breakdown of larger molecules to Mooresville smaller ones.
Metabolism in the body is a collection of chemical reactions that takes place in the body’s cells. Metabolism converts the nutrients in the food that we eat (digestive system) in to essential energy which is needed to power all the things we do, from something as