Respiration: Respiration is the release of energy from glucose or another organic chemical. The chemical energy in glucose can be used to provide the energy required for growth, repair and movement. In fact most things you do require energy.
There are two types of respiration:
External respiration
Internal respiration
External Respiration: We can define external respiration as the process by which external air is drawn into the body in order to supply the lungs with oxygen, and air is expelled out from the lungs in order to remove carbon dioxide from to body.
Internal respiration: Internal respiration concerns the exchange of gases in the lungs with those in the tissues. Internal respiration is the processes by which the gases in the air that has already been drawn into the lungs by external respiration are exchanged with gases in the blood/tissues so that carbon dioxide (CO2) is removed from the blood and replaced with oxygen (O2).
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