Match the following terms to their definitions. Drag the appropriate labels to t

Question

Match the following terms to their definitions. Drag the appropriate labels to their respective targets. Terms may be used more than once. 1.: No exchange of gases occurs here. 2.: Secrete a fluid containing surfactant. 3.: Where the respiratory zone of the lungs begins. 4: Form a simple squamous epithelium in the alveoli. 5.: Terminates in alveoli. 6.: Are cuboidal cells. 7. The respiratory membrane consists of 3 layers: capillary endothelium, fused basement membrane and alveolar epithelium consisting of .

Explanation / Answer

1. Segmental bronchi

2. Type II cells

3. Respiratory bronchioles

4. Type I cells

5. Alveolar duct

6. Type II cells

7. Type I

Type I cells - these are alveolar cells that are composed of squamous epithelium and are involved in gas exchange .

Type II cells - These cover a small fraction of alveolar surface area. They secrete a pulmonary secretion which reduces the surface tension in the alveoli.

Respiratory bronchioles- They are characterised by the presence of alveoli in their walls , which splits into the alveolar ducts, and terminate in alveolar sacs.

Alveolar ducts - These are tiny ducts that contains a small collection of alveoli and end or terminate into alveoli.

Segmental bronchi- These are also known as tertiary bronchi which gives a bronchopulmonary segment, which is a division of lung separated from the rest of the body.

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