Lung parts functions
- Created by: Molly Webb
- Created on: 04-04-15 15:02
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- Mammalian lungs adaptations
- Epithelial tissue line the trachea and the bronchi
- Made of ciliated cell and goblet cells
- sitting on a basement membrane
- contains fibres made from proteins
- Each cilium contains microtubules which slide past each other
- this causes the cilium to bend
- Goblet cells secrete mucus
- contains glycoproteins in mucus
- the long sugar chains make the mucus slimy and sticky
- forms a complete protective covering over epithelium
- stops the cells from drying out
- traps particles from the air
- this prevents them reaching the alveoli and causing damage
- traps particles from the air
- contains glycoproteins in mucus
- sitting on a basement membrane
- Made of ciliated cell and goblet cells
- Cartilage
- tough tissue
- supports the walls of trachea and bronchi
- cartilage does not reach to/past the bronchioles
- more flexible than bone
- helps to hold the tubes open as the air pressure inside them changes
- In trachea they are c-shaped rings
- In bronchi- they are more of an irregular pattern
- In trachea they are c-shaped rings
- helps to hold the tubes open as the air pressure inside them changes
- tough tissue
- Smooth muscle
- In the walls of the trachea, bronchi and bronchioles
- contracts slowly and steadily
- can remain contracted for long periods of time
- involuntary mucle
- when it contracts it narrows the airways
- useful to change the diameter of small bronchioles
- they can be made wider when a person is exercising= needs air in and out more rapidly
- useful to change the diameter of small bronchioles
- when it contracts it narrows the airways
- they can also react to drugs
- beta agonists can be inhaled to help make muscles relax
- Elastic fibres
- found in all airways
- Important especially in alveoli-
- breathing in- alveoli expand and stretch the elastic fibres
- breathing out= the fibres RECOIL
- This helps to decrease the volume inside the lungs and forces air out
- Important especially in alveoli-
- found in all airways
- Epithelial tissue line the trachea and the bronchi
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