Gas-exchange system - lungs
- Created by: Betty
- Created on: 31-03-13 20:07
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- Structure of human gas-exchange system
- Trachea
- Flexible airway that is supported by rings of cartilage that prevent the trachea collapsing as the air pressure inside falls when breathing in.
- Walls are made up of goblet cells that produce mucus which traps dirt particles and bacteria from air breathed in.
- The Cila removes mucus up the throat where it is digested through the body.
- Bronchi
- Two divisions of the trachea that each lead to the lungs
- Like the trachea, it traps dirt particles by producing mucus
- Bronchioles
- Series of branching subdivisions
- Walls lined with a muscle that contains lots of epithelial cells. This allows them to constrict so that they control air flow in and out.
- Alvelio
- Minute air-sacs at the end of the bronchioles
- They spring back during breathing out in order to expel carbon dioxide rich air.
- The membrane is the gas-exchange surface.
- Trachea
- The Cila removes mucus up the throat where it is digested through the body.
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