Explain the difference between respiration and breathing?
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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, oit 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.

Unfortunately, some people do still use the two words to mean the same thing. Also, the breathing system is also called the respiratory system. Just to make it worse, giving someone the 'kiss of life' is called artificial respiration, instead of artificial breathing!

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).

One last complication: breathing is sometimes called 'external' respiration, and respiration is sometimes called 'internal' or 'cellular' respiration, there is also aerobic and unaerobic respiration...

See:

http://www.kidshealth.org/kid/body/lungs_noSW.html

http://www.kidshealth.org/kid/watch/er/cpr.html

http://www.bbc.co.uk/schools/gcsebitesize/biology/humansasorganisms/3respirationrev1.shtml

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