Question

1) what type of epithelium lines the trachea and larger bronchi?

2) what type of epithelium lines the smaller bronchioles?

3) what type of epithelium makes up the alveolar walls?

4) what is the function of the epithelium at each of these locations:
Trachea and bronchi:
Alveoli:

Answer 1

1) Trachea is lined by pseudostratified columnar epithelium and larger Bronchi are also lined by pseudostratified columnar epithelium.

2) Smaller Bronchioles are lined by simple cuboidal epithelium.

3) Alveolar walls are lined by squamous epithelium.

4) the function of epithelium at following sites are as follows:

Trachea and bronchi- trachea and bronchi are lined by pseudostratified columnar epithelium, it contains ciliated cells , movement of ciliated cells removes the dirt and mucus and pushes it towards the pharynx where it can be swallowed.

Alveoli - alveoli are lined by simple squamous epithelium. They play the function of gaseous exchange across the membrane. They help in respiratory function. Diffusion of oxygen and co2 occurs across alveolar epithelium.

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