difference between internal and external respiration
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Internal restoration is also called cellur respiration. It involves the release of energy in cells. It takes place in all living cells throughout the good
External respiration is also called breathing. It involves the exchange of two gases - oxygen and carbon dioxide. Specific organs, tissues or cells are used for the external respiration.
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when the intercostal muscles contracts the ribs are moved downwards
when the external intercoastal contracts they move the ribs upwards
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