Gaseous Exchange
- Created by: NWILKA1
- Created on: 29-05-14 14:55
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- Gaseous Exchange
- Lungs
- Protected by the thorax
- Protected by the ribcage
- Protected by the thorax
- Separated from the lower part of the body by the diaphram
- What does the breathing system do?
- Takes air into and out of the body
- WHY?
- So that oxygen from the air can diffuse into the bloodstream, and carbon dioxide can diffuse out of the bloodstream.
- WHY?
- Takes air into and out of the body
- To make air move into the lungs, the ribcage moves out and up and the diaphram become flatter
- These changes are reversed to make air move out of the lungs.
- This is known as ventilation
- These changes are reversed to make air move out of the lungs.
- Lining of the airways
- Cilia cells
- To waft mucus up the nose so you can either swallow or spit it out
- Mucus
- To trap bacterial particles
- Cilia cells
- Gas exchange surfaces
- Effectiveness is increased by...
- Being thin - short diffusion pathway
- Having a large surface area (vill and alveoli)
- Maintaining a large concentration gradient
- Sufficient blood supply
- Being ventilated
- Effectiveness is increased by...
- Lungs
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