Energy
According to Wright (2007), we need energy for everything we do. Energy can be found in different forms including chemical energy, electrical energy, thermal energy, radiant energy, mechanical energy and nuclear energy. We use energy all the time including when we are sleeping. We use energy for our muscle activity, new cells and blood circulation. (Wright, 2007)
We get energy from the foods that we eat. Metabolism is a chemical activity which uses cellular respiration. (Wright, 2007) Aerobic respiration is respiration with oxygen present. (Wright, 2007) The formula for cellular respiration is below:
Glucose +oxygen = Energy, carbon dioxide and water. Carbon dioxide and water are the waste products from creating energy.
Respiration can happen without oxygen. This process is called anaerobic respiration. The equation glucose+ oxygen which produces energy along with the bi-products produces 38 Adenosine Triphosphate (ATP). It produces more ATP because it has oxygen present (aerobic) this is used more effectively in the body for things like growing. The rest is wasted through heat as a bi-product which can be good as we need to stay warm. ATP is the unit for measuring energy. Respiration without oxygen produces 2 ATP so the energy is not as efficient as there is not as much ATP being produced. Whereas from the equation where oxygen is present, it produces 38 ATP which is more efficient which is used for activities like movement. (Khan Academy, 2009)
You can then proceed to the below equation is an example of anaerobic respiration:
Glucose =lactic acid +energy.
Aerobic respiration happens in the mitochondria whereas anaerobic respiration occurs within the cytoplasm. (Wright, 2007) Metabolic rate is the amount of energy used in a certain period