Respiratory system

RESPIRATORY SYSTEM

All living organisms are made up of a number of cells. Each of these cells requires oxygen to break down food and obtain energy.
The intake of air rich in oxygen (inhalation or breathing in) is the first step.
After that, it involves a series of chemical reactions, which help in the release of energy.
Several enzymes and catalysts (substances that speed up reactions) are also involved in this process.
When components of food are broken down, water and carbon dioxide.
Carbon dioxide is toxic to the body, so it has to be moved out.
The removal of carbon dioxide (exhalation or breathing out of air rich in carbon dioxide) completes the cycle.
The fundamental difference between breathing and respiration is:
Breathing is the process of intake of air rich in oxygen (inhalation or breathing in) and giving out air rich in carbon dioxide (exhalation or breathing out).
Respiration is the process of releasing energy from the breakdown of food.
Breathing brings in oxygen, which is usually necessary for cellular respiration, in our lungs.
Respiration is the release of energy from food, usually sugar. It is a chemical reaction which takes place inside all living cells.
Breathing is the process by which air is drawn into and out of the lungs.
When air is in the lungs, oxygen is taken into the body.
The oxygen is then used during respiration to 'burn' the food, releasing its energy.
When food burns, it produces waste carbon dioxide. This CO₂ is passed out of the body from the lungs when we breathe out.
So, respiration and breathing are connected, but they are not the same thing.
Breathing is sometimes divided into two stages: ventilation (the movement of air in and out of the lungs) and gas exchange (the absorption of oxygen from the lungs and the release of CO₂ into the lungs).
Breathing is sometimes called 'external' respiration, and respiration is sometimes called 'internal' or 'cellular' respiration, there is also aerobic and anaerobic respiration.

Difference between breathing and respiration:

	Breathing		Respiration
1.	It is the process of inhalation and exhalation.	1.	It is a series of chemical reactions that result in the release of energy by the oxidation of food molecules.
2.	It is a physical process.	2.	It is a chemical process.
3.	It takes place outside the cells.	3.	It takes place inside the cells.
4.	No chemical reactions takes place, only an exchange of gases is involved. No enzymes or other catalysts are involved.	4.	Enzymes and other catalysts are involved in the whole process.
5.	No energy is released during this process.	5.	Energy is released during the process.