the surface area of the lungs is increased by the alveoli (air sacs), the lungs are ventilated to maintain a steep diffusion gradient, oxygen diffuses into the many capillaries surrounding the alveoli and carbon dioxide diffuses back into lungs
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VENTILATING THE LUNGS
VENTILATING THE LUNGS
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what exchange surface do the lungs contain?
th breathing system
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where are the lungs situated
in the thorax, inside the ribcage and above the diaphram, which seperates the lungs from the abdomen
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what happens to our intercostal muscles when we breathe in?
they contract
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what happens to the ribcage and diaphram when we breathe in?
the ribcage moves up and out and the diaphram flattens
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what happens to the thorax when we breathe in?
the volume of thorax increases
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what happens to the pressure of the thorax when we breathe in?
the pressure in thorax decreases and air is drawn in
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what happens to the intercostal muscles and diaphram when we breath out
they relax
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what happens to the ribcage when we breathe out
the ribcage moves down and in and the diaphram becomes domed
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what happens to the thorax?
the volume decreases and the pressure increases so air is forced out
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what is the movement of air in and out of the lungs known as?
ventilation
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Other cards in this set
Card 2
Front
describe the lungs exchange surface
Back
the surface area of the lungs is increased by the alveoli (air sacs), the lungs are ventilated to maintain a steep diffusion gradient, oxygen diffuses into the many capillaries surrounding the alveoli and carbon dioxide diffuses back into lungs
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