Question

Type I pneumocytes __________.

1) prevent the passage of albumin into the alveolus
2) are more numerous than Type II pneumocytes
3) produce surfactant
4) are capable of rapid cell division

Answer 1

Type I pneumocytes facilitate gas exchange, are more numerous than Type II pneumocytes, and do not produce surfactant or divide rapidly. The correct option is 2).

Step-by-step explanation:

Type I pneumocytes are squamous epithelial cells that constitute a significant portion of the alveolar surface area and are highly permeable to gases. Their primary function is to facilitate gas exchange and provide a barrier to large molecules.

On the other hand, Type II pneumocytes are the cells responsible for producing pulmonary surfactant, which is crucial in reducing the surface tension within the alveoli and preventing alveolar collapse.

Therefore, the correct statement regarding Type I pneumocytes is that they are more numerous than Type II pneumocytes, covering up to 97 percent of the alveolar surface area. Option 2) is the correct one.