Gas Exchange
- Created by: sophieamyx
- Created on: 27-06-17 10:30
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- Gas exchange
- Diffusion
- Passive movement of particles
- No energy is needed
- Net movement of particles from an area of high concentration to a low concentration
- Particles diffuse down a concentration gradient
- Net movement is the overall direction
- Continues until particles are evenly distributed throughout liquid/gad
- Passive movement of particles
- Exchange surfaces are adapted for efficient diffusion
- Common factors in gas exchange surfaces
- 1) Gives gas exchange organs a large surface area to volume ratio
- Increases rate of diffusion
- 2) Thin, which provides short diffusion across the gas exchange surface
- Increases rate of diffusion
- 2) Thin, which provides short diffusion across the gas exchange surface
- 1) Gives gas exchange organs a large surface area to volume ratio
- Common factors in gas exchange surfaces
- The smaller the surface area to volume ratio, the slower the rate of exchange
- In the Lungs
- Gas exchange surface in lungs is called the Alveolar Epithelium (AE Surface is a layer of thin, flat cells)
- Oxygen diffuses out of the alveoli. across the AE Surface, then the capillary endothelium, and into the blood
- Carbon dioxide diffuses into the alveoli from the blood and is breathed out
- Features in the lungs
- A lot of alveoli means larger surface area for diffusion
- The AE surface and Capillary endothelium are one cell thick, short diffusion pathway
- Alveoli all have good blood supply from capillaries, they maintain the centration gradient by taking oxygen away and bringing more carbon dioxide
- Breathing in and out refreshed the air in the alveoli
- Diffusion
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