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Respiration :tada: (what happens in our muscle cells? (A person's…
Respiration :tada: 
there are 2 types!
aerobic respiration
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a large amount of energy is produced but it also gives off carbon dioxide and water as waste products
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what happens in our muscle cells?
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But :warning: the person may face fatigue and muscular pains due to the accumulation of lactic acid caused by anaerobic respiration .
So in the liver, lactic acid is oxidised to release energy. This energy is used to convert the remaining lactic acid to glucose.
Oxygen debt is repaid after all the lactic acid is converted and glucose is then transported back to the muscles
Gas Exchange
in humans
The absorption of atmospheric oxygen and the removal of carbon dioxide from the body occur in the alveoli in the lungs
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Humans have a small surface area to volume ratio, so we need a special system of organs for gaseous exchange between the environment and the cells in our bodies
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:red_flag: Respiration consumes oxygen and produces carbon dioxide, water and heat (energy)
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Differences in inspired air and expired air
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expired air
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Dust Particles: little, if any
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