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Alveolus The sac-like end of an airway in the lungs. The surface is enlarged to maximise gas exchange.
Expiration Breathing out.
Inspiration Breathing in.
Active Transport In active transport, cells use energy to transport substances through cell membranes against a concentration gradient.
Anaerobic Respiration A series of chemical reactions that transfer energy from glucose into life processes without using oxygen.
Villus A small projection on the inner surface of the gut to increase the surface area and so speed up absorption.…read more


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