# data[].attributes.body
blood has higher concentration of haemoglobin, making it easier to carry oxygen to the lungs which lowers the oxygen concentration in alveoli

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(105-40)/40*100 percent＝163percent

# data[].attributes.body
Because the fresh air inhaled will mix with the air that already existed in the alveoli, which will let the oxygen concentration become lower.

# data[].attributes.body
the partial pressure of oxygen is 163% higher in the alveolus.

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Oxygen in the alveoli mixes with leftover air from the previous breath, which has less oxygen.

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Diffusion

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diffusion

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Because the higher concentration gradients are stored in the alveoli and do not enter the bloodstream

# data[].attributes.body
Diffusion

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Because the high concentration gradient maintains the oxygen in alveoli

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163% higher

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Diffusion

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higher haemoglobin concentration in blood

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air exhaled's carbon dioxide concentration is 800% higher than air inhaled

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800% higher

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163% higher

# data[].attributes.body
163% higher

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Inhalation mainly inhale oxygen; Carbon dioxide is release in exhalation

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163% ⬆️

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Diffusion

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800% higher

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Diffusion

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800% ⬆️

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co2 produce by cell respiration

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We do not need nitrogen in the blood because our blood already has nitrogen

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We don't need nitrogen in our blood to keep our body functioning

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Carbon dioxide diffuses from the blood into the alveoli and is then exhaled.

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diffusion

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800% increase

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163% higher

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Carbon dioxide produced by cell respiration is then diffused into the alveoli then exhaled

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Nitrogen not used by tissues of the body

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Because some of the oxygen has diffused into the capillaries surrounding the alveoli, where the partial pressure of oxygen is lower.

# data[].attributes.body
there is no concentration gradient that allow nitrogen to pass through our blood