What can the trachea, bronchi and bronchioles be described as?
Airways that allow passage of air into the lungs and out again.
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What must the airways be to be effective?
Larger airways must be large enough to allow sufficient air to flow without obstruction. must be able to stretch and recoil. Must be flexible to allow movement. Must divide into smaller airways to deliver air to all alveoli.
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Continue last question
Must be strong enough to prevent them from collapsing when air pressure is low inside during inhalation.
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What differs between the trachea and bronchi?
The size. Bronchi are narrower than the trachea.
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Describe the walls of the trachea and bronchi
Much of the wall consists of cartilage. Both have relatively thick walls with several layers of tissue.
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What is on the inside of cartilage?
A layer of glandular tissue, connective tissue, elastic fibres, smooth muscle and blood vessels. Called the loose tissue.
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What is the inner lining?
An epithelium layer that has 2 types of cell. Most cells have cilia known as ciliated epithelium. Among the ciliated cells are goblet cells.
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What is cartilage in the form of?
Form of incomplete rings/C rings in the trachea but less regular in the bronchi.
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What is the difference between bronchioles and bronchi?
Bronchioles are much narrower than bronchi.
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What may larger bronchioles have compared to smaller ones?
Some cartilage, but smaller ones have no cartilage.
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What is the wall of the bronchioles mostly made of?
Smooth muscle and elastic fibres.
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What do smaller bronchioles have?
Clusters of alveoli at their ends.
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Other cards in this set
Card 2
Front
What must the airways be to be effective?
Back
Larger airways must be large enough to allow sufficient air to flow without obstruction. must be able to stretch and recoil. Must be flexible to allow movement. Must divide into smaller airways to deliver air to all alveoli.
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