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What are the GCSE knowledge of the features → trachea , bronchi , bronchioles ?
Trachea : C shaped ring of cartilage for support , to prevent collapse when air pressure inside is lower than external pressure
→ flexible to allow movement + lined with cilla
→ Large enough to allow sufficient passage of air
What the the different cell in the respiratory + airways ?
Cillated Epithelium
Goblet Cell
Smooth muscle cell
What is the function of cillated epithelium cell ?
Epithelial cell lining the trachea, bronchi , bronchioles have cilla on their plasma membrane
Cilla are the microscopic hairs which waft mucous to the back of the throat
What is the function of goblets cells ?
It is in between the cillated epithelium cell
To secrete mucous which traps pathogens and other small particle, that are inhaled.
What are the functions of smooth muscle cell ?
Contracts and constrict airways, making the lumen narrower and restricting the flow of the air into the alveoli
It;s found in the outer layer of the trachea, bronchi , bronchioles.
Elastic fibre : allows airways to recoil when smooth muscle relaxes
When does the smooth muscle cell contract and constrict ?
People who have asthma or breathing toxic chemical / gas
