Question

Distinguish between respiration and combustion.

Answer 1

Hint: Life processes require energy that is produced in the body itself. Our body regulates the release of energy. Respiration and Combustion are different from each other chemically.

Complete answer:
There are some processes essential for an individual to live. These include organization, metabolism, responsiveness, movement, and reproduction. One more important process is respiration which involves the production of energy.
The following are the distinguishing points between respiration and combustion:

Respiration	Combustion
1. It is a cellular process that occurs inside the cell. Here oxygen is inhaled and carbon dioxide is exhaled out of the body.	1. It is a non-cellular process. Here burning of substance takes place in the presence of oxygen to form carbon dioxide and water.
2. It occurs under biological control and releases energy in steps in the form of ATP. Less than ${ 50 }$% of energy is liberated as heat.	2. It is an uncontrolled process where energy is released in a single step in the form of heat. ATP is not formed here.
3. The temperature is not allowed to rise as it can damage the cell.	3. The temperature is very high, usually higher than respiration.
4. It is the process of oxidation of food materials. It does not require external heat. Oxidation occurs at the end of the reaction between oxygen and reduced coenzymes.	4. It is the process of burning sugar to form carbon dioxide and water. External heat is required to burn the sugar. Substrates are directly oxidized in combustion.
5. For respiration, enzymes are required.	5. As it is a non-cellular process, it does not require enzymes.
6. Several intermediates are formed, utilized in the synthesis of different organic compounds.	6. No intermediates are produced.
7. Each step or reaction requires several enzymes.	7. It is a non-enzymatic process.
8. It is a biochemical process.	8. It is a physicochemical process.

Note:
- During each inhalation, the breathing process does not fill the alveoli with atmospheric air, but it firstly dilutes the inhaled air and thoroughly mixed with a large volume of gas mentioned because the functional residual capacity, this remains within the lungs after each exhalation, and whose gaseous composition differs markedly from that of the atmospheric air.
- Combustion is an endothermic reaction. During combustion, Heat and light energy are produced, more of it being heat energy. Combustion does not involve the formation of ATP whereas in respiration It is formed on the breakage of molecular bonds.
- Mr. Lavoisier (Antoine-Laurent Lavoisier) discovered combustion in 1772.
- During respiration, the body temperature does not rise whereas during combustion it becomes very high.