Respiration is one of the important chemical processes in all the living organisms. It could happen either in the presence of oxygen (aerobic) or the absence of Oxygen (anaerobic-mainly in single-celled or multicellular organisms). For instance, human beings undergo the process of respiration by inhaling oxygen and exhaling carbon dioxide. Many living organisms whether plants or animals undergo this process to use their food energy.
The general diagram of this process is as shown below-
Respiration is of two types, namely aerobic respiration, and anaerobic respiration.
Aerobic respiration is a process in which the food glucose is converted into energy in the presence of oxygen. The general equation of aerobic respiration as a whole is as given below-
Glucose + oxygen ==Carbon-dioxide+ Water+ Energy
In the above equation, energy is released by the breaking up of glucose by oxygen and as a result of this, the water and the carbon-dioxide are being produced as one of the resultant of the reaction. When one molecule of glucose is broken, 2900 kJ of energy is released. This is used in-turn to create a new type of energy molecule called as the ATP of the Adenosine Triphosphate. The body uses this ATP generated as the energy for various purposes.
Aerobic respiration process also takes place in animals, plants and other living organisms. Firstly the oxygen enters the cells of plants with the help of stomata. Plants produce their food with the aid of photosynthesis process and thus release energy from it through the respiration process. The below equation describes the process of photosynthesis or the aerobic respiration in plants.
Carbon-dioxide + water== Glucose + Oxygen
Anaerobic, the word itself would say about what the process is. Anaerobic respiration is a process which takes place due to the lack of oxygen. In this process, the energy is obtained by the breakdown of glucose in the absence of oxygen. One of the well-known examples of anaerobic respiration is fermentation in yeast.
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