What is meant by External respiration.
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exchange of gases between the external environment and a distributing system of the animal body (such as the lungs of higher vertebrates or the tracheal tubes of insects) or between the alveoli of the lungs and the blood
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The first step of respiration in which external air is drawn inside the body via breathing so that oxygen is reached into the lungs. The used air that is carbon-dioxide is then released finally from the lungs.
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