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bala9639:
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5) anaerobic respiration happen to muscle during hard exercise.
6) they respire though their skin
7) Anathlete need to supply extra energy to muscle cells which have worked hard during running. for this , he breathed faster and deeper so that more oxygen is supplied to the cell.
8) fish respire their gills .
9) frogs respire to their skin , lungs , lining of mouth , etc.
10) human muscle cells, bacteria, yeast etc .
11) 12-18 per minute
12) carbon dioxide
13) during inhalation, the lungs expand with air and oxygen diffuse.
during exhalation, the lungs expels the air and lungs volume decrease.
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