Question

What is the relation between aerobic cellular respiration, anaerobic cellular respiration and breathing?

Answer 1

Hint: Cellular respiration is the process through which cells convert glucose into energy. It is a chemical reaction that occurs in all living cells, including the plant cells and animal cells. Cellular respiration and breathing are not the same. Breathing is a process where inhalation of oxygen and exhalation of carbon dioxide take place.

Complete answer:
In the presence of oxygen, aerobic respiration occurs. In this reaction, glucose is broken down into carbon dioxide and water. It occurs in the mitochondria and cytoplasm of the cell. The oxygen needed for this reaction is provided through the breathing process. Aerobic respiration takes place mostly in higher mammals.
Anaerobic respiration takes place in the absence of oxygen. Here the glucose molecule is broken down into ethanol, carbon dioxide and energy. It takes place only in the cytoplasm. Anaerobic respiration occurs mostly in lower organisms such as bacteria and yeast.
During breathing oxygen is inhaled into the body. The oxygen molecules are readily absorbed by the cells to metabolise the food and turn it into energy through respiration. The carbon dioxide molecules evolved during this process are carried by the blood back to the lungs, where it is exhaled out. Hence breathing is an important process for cellular respiration to take place in a cell.
However, this process is absent in anaerobic respiration as oxygen is not required. Here the exchange of gas molecules does not take place.

Note:
Respiration is an involuntary chemical reaction. Many enzymes are used by the cells during respiration. Anaerobic respiration takes place in multicellular organisms also. During vigorous exercise, humans undergo anaerobic respiration. Here lactic acid is produced as the waste by-product instead of carbon dioxide.