Biology - Gas exchange in lungs - B3.1.2

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  • Created by: shcoool
  • Created on: 15-05-15 22:45
Where are the lungs located in the body?
In the upper part of the body (thorax) and separated from the lower part of the body (abdomen) by the diaphragm, protected by ribcage
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What does the breathing system do?
Takes air into and out of the body so that oxygen from the air can diffuse into the bloodstream and carbon dioxide can diffuse out of the bloodstream into the air
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How does air move into the lungs?
intercoastal muscles contract so that the ribcage moves out and up, the diaphragm contracts and becomes flateer
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Hows do the previous actions move the air in and out of the lungs (ventilation)?
Increases volume of thorax, air pressure is reduced in lungs, pressure gradient is high so air goes in. this is reversed to make air move out
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REVISION: How is the exchange surface effective?
alveoli - large surface area, one cell thin - short diffusion path, efficient blood supply - maintain a concentration gradient, being ventilated - maintain a concentration gradient
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Other cards in this set

Card 2

Front

What does the breathing system do?

Back

Takes air into and out of the body so that oxygen from the air can diffuse into the bloodstream and carbon dioxide can diffuse out of the bloodstream into the air

Card 3

Front

How does air move into the lungs?

Back

Preview of the front of card 3

Card 4

Front

Hows do the previous actions move the air in and out of the lungs (ventilation)?

Back

Preview of the front of card 4

Card 5

Front

REVISION: How is the exchange surface effective?

Back

Preview of the front of card 5

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