It is called anaerobic respiration because it takes place without air which contains oxygen (‘anaerobic’ means ‘without air’).
The microscopic organisms like yeast and some bacteria obtain energy by anaerobic respiration (which is called! In anaerobic respiration, the micro-organisms like yeast break down glucose (food) into ethanol and carbon dioxide, and release energy. Anaerobic respiration produces much less energy which gets stored in the ATP molecules.
: The respiration which uses oxygen is called aerobic respiration.
It is called aerobic respiration because it uses air which contains oxygen (‘aerobic’ means ‘with air’).
We (the human beings) obtain energy by aerobic respiration.
But anaerobic respiration can sometimes take place in our muscles (or the muscles of other animals).This oxygen breaks down lactic acid accumulated in muscles into carbon dioxide and water, and hence gives us relief from cramps.The anaerobic respiration does not take place only in the muscles of human beings, it also takes place in the muscles of other animals such as lion, tiger, cheetah, deer, and many other animals when they run very fast and require much more energy than normal.Close the mouth of the test-tube with a cork and allow it to stand for some time. A characteristic smell of ethanol (ethyl alcohol) is obtained from the test-tube. When this gas is passed through lime-water, the lime-water turns milky showing that it is carbon dioxide gas.This experiment tells us that the products of fermentation of sugar brought about by yeast are ethanol and carbon dioxide.Thus, muscle cramps occur due to the accumulation of lactic acid in muscles when the muscles respire an aerobically (without oxygen) while doing hard physical exercise.We can get relief from cramps in muscles caused by heavy exercise by taking a hot water bath or a massage.Please note that all the organisms which obtain energy by anaerobic respiration can live without oxygen (of air).For example, the single-celled, non-green plant called ‘yeast’ can live without oxygen because it obtains energy by the process of anaerobic respiration.In aerobic respiration, the glucose food is completely broken down into carbon dioxide and water by oxidation.Aerobic respiration produces a considerable amount of energy for use by the organism which gets stored in the ATP molecules.