Difference Between Respiration and Combustion

Difference Between Respiration and CombustionThe main difference between respiration and combustion is that respiration is the metabolism of glucose to release energy or produce ATP, while combustion burns matter to provide external heat for energy.

Organisms need energy to carry out cellular functions. Some processes occur without using energy, but most cellular processes use energy.

Cellular respiration is a process that generates cellular energy mainly in the form of ATP. Glucose is the main energy source for this process. During respiration, ATP is produced as a result of metabolism of glucose molecules in the presence of oxygen.

Combustion is also a process that releases energy but in the form of heat. This requires external heating. Therefore, respiration and combustion are separate from each other.

The difference between respiration and combustion becomes apparent when you realize that they are “chemically” the same process.

But during breathing, certain processes and enzymes in our bodies regulate this energy production process, so that our food does not burn spontaneously like fuel in rockets.

What is Respiration?

Application involves a series of reactions in combination with combustion and reduction reactions and electron transfer. At the end of respiration, organisms produce energy in the form of ATP (the energy currency of the cell) to use in their metabolic processes. Respiration occurs with and without oxygen. Therefore, respiration can be aerobic or anaerobic.

During aerobic respiration, oxygen molecules act as terminal electron acceptors and are reduced to form water. This creates an electrochemical gradient that drives ATP synthesis.

Aerobic respiration consists of three important steps, including the rearrangement of carbon molecules to produce ATP through a series of enzyme-catalyzed reactions.

The first step known in aerobes and anaerobes is the glycolytic pathway, which produces two molecules of pyruvate from glucose. Here, the reaction releases two molecules of ATP and two molecules of NADH.

What is Combustion?

Combustion is the heating of a substance to release energy mainly in the form of heat. It does not occur in living cells. This requires external heating. Therefore, when heat is applied, it accelerates uncontrollably, producing heat instantly.

No enzymes or other chemicals are needed for combustion. In fact, it is a cellular system that does not produce any intermediates. In addition, like respiration, combustion occurs in the absence of water. Burning fuel for energy is a familiar example of combustion. Combustion is a common process in rocket engines.

Difference Between Respiration and Combustion

Respiration Combustion
Respiration is a biochemical process that takes place in living cells to release energy. Combustion is a chemical process that occurs outside living cells or living systems.
Respiration is a controlled biological process. Combustion is an uncontrolled process.
Energy is released in a stepwise manner with different biochemical reactions. Energy is released in a single step.
Less than half of the energy is liberated as heat. Energy is released in the form of heat. Explosive Combustion can also produce Heat, Light and Sound.
Temperature is not allowed to rise beyond control as it can cause damage to the cell. The temperatures can go very high during a combustion process.
Energy is stored in the form of Adenosine triphosphate (ATP). On breakage of the molecular bonds within ATP, energy is released for physiological processes. Adenosine triphosphate is not formed.
Oxidation occurs at the end of the reaction between oxygen and reduced coenzymes in the electron transport chain. Substrates are directly oxidised in the combustion process.
Enzymes are required for the process of respiration. Enzymes are not required for combustion as it is a non-cellular process.
Example: Aerobic respiration. Example: Combustion of oxygen and hydrogen into water vapour.


Related Articles

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button