tissues in lungs
- Created by: Harpreet
- Created on: 15-11-13 17:56
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- Tissues in the lungs
- the lungs
- airways
- trachea
- bronchus
- larger airways must be large enough- allow enough air to flow through without obstruction
- they must also divide into smaller airways-to get to the alveoli
- must be strong: to prevent them from collapsing when pressure inside is low
- this low pressure happens during inhalation
- narrowest airway leading to alveoli, virtually no cartilage
- airways
- trachea and bronchi
- have similar structure
- onyl differ in size: bronchi is narrower than trachea
- have thick walls that have several layers of tissue
- most of the walls consist of cartilage
- in the form of C rings in the trachea but is less regular in the bronchi
- on the inside surface of the cartilage is a layer of glandular tissue, elastic fibres, connective tissue, smooth muscle + blood vessels
- this is often called loose tissue
- the inner lining is an epithelium layer that has two types of cell
- ciliated epithelium
- cells that have little projections
- called cilia
- these waft the mucus produced by the goblet cells up the trachea
- so no toxic substances get into the lungs
- the mucus is wafted to the back of the throat and then swallowed
- these waft the mucus produced by the goblet cells up the trachea
- called cilia
- cells that have little projections
- goblet cells
- these cells secrete the mucus
- ciliated epithelium
- the main difference is that trachea has more regular cartilage
- have similar structure
- cartilage
- plays a structural role: supports trachea + bronchi, holding them open.
- this prevents them collapsing when the pressure inside is low during inhalation
- does not form a complete ring: C shaped
- why?
- to allow flexibility when you move your neck so it is not constricted
- also allows for the oesophagus to expand when food is swallowed
- why?
- plays a structural role: supports trachea + bronchi, holding them open.
- smooth muscle
- can contract which constricts airways:makes lumen narrower
- what is the effect of constricting the bronchioles?
- Untitled
- what is the effect of constricting the bronchioles?
- can contract which constricts airways:makes lumen narrower
- the lungs
- the lungs
- airways
- trachea
- bronchus
- larger airways must be large enough- allow enough air to flow through without obstruction
- they must also divide into smaller airways-to get to the alveoli
- must be strong: to prevent them from collapsing when pressure inside is low
- this low pressure happens during inhalation
- narrowest airway leading to alveoli, virtually no cartilage
- airways
- bronchioles
- larger bronchioles may have some cartilage but smaller ones have none
- their walls are made mostly of smooth muscle and elastic fibres
- they must be flexible; to allow movement
- this is often called loose tissue
- role of mucus
- to trap tiny particles from entering the lungs
- this may include pollen and bacteria
- trapping any particles may reduce the risk of infection
- to trap tiny particles from entering the lungs
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