biology-the human respiratory system

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why do we need a respiratory system?
to get oxygen into the blood,to be carried around the body for use in respiration, and to remove waste co2 from the blood.
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diagram of the respiratory system
x
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diagram of the alveoli
x
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how are alveoli(air sac's) adapted for gas exchange?
provides a large surface area for gas exchange,thin walls of A mean gases can pass through. Moist lining allows oxygen to dissolve.Have food blood supply,so more gases can be exchanged.
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name the differences between inspired and expired air
IA-breathed in,body absorbs oxygen from this EA-breathed out,adds co2 and water vapour before breathing it out,less oxygen,more co2,more water vapour.
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describe the breathing mechanism
diaphragm moves down+rid cage moves up and out-cases increase in volume of thorax.Increased vol-means pressure lower-allows lungs to expand.air is drawn in.Diaphragm moves upwards+rib cage moves in and down.-decreases vol+increases pressure of tho
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finished:)x
x
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Other cards in this set

Card 2

Front

diagram of the respiratory system

Back

x

Card 3

Front

diagram of the alveoli

Back

Preview of the front of card 3

Card 4

Front

how are alveoli(air sac's) adapted for gas exchange?

Back

Preview of the front of card 4

Card 5

Front

name the differences between inspired and expired air

Back

Preview of the front of card 5
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