Respiration is the metabolic process that happens in all organisms. Breathing and respiration are necessary for a living organism. Breathing is a physical process which involves the inhaling and exhaling of air through the lungs. This exchange of gas is essential for respiration.
Respiration is considered a biochemical process that occurs within the cells of organisms. In this process, the energy is produced by the breakdown of the glucose, which is further used by cells in various function. Every living species, from a single-celled organism-bacteria to dominant multicellular organisms, go through respiration.
There are two respiration types which we classify on the basis of the presence or absence of oxygen
1. Aerobic respiration
The respiration that takes place in the presence of oxygen is called aerobic respiration because it uses ‘air’ which contains oxygen. The aerobic respiration involves utilization of oxygen for the breakdown of chemical bonds in glucose to release energy in high amounts. It is the chief source of energy for plants and animals. Animals and plants that use oxygen for respiration are aerobes. Majority of animals have aerobic respiration.
All the organisms that obtain energy by aerobic respiration cannot live without the oxygen. This is because if there is no oxygen, they cannot get energy from the food which they eat. Aerobic respiration produces more energy because a complete breakdown of glucose occurs during respiration by the use of oxygen.
2. Anaerobic respiration
It is a type of cellular respiration which takes place in the absence of oxygen to produce energy. The chemical equation for anaerobic respiration is
Anaerobic respiration produces much less energy because the only partial breakdown of glucose occurs in anaerobic respiration in the absence of oxygen. All the organisms which obtain energy by anaerobic respiration can live without the oxygen.