Cells lining the alveoli secrete a soapy substance known as:
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Ответ:
Surfactant Alveolar is a type of substance secreted by pneumocytes II (one type of cell that forms the epithelium in the alveolar membrane). This substance is known as an tensioactive agent, decreasing the surface tension within the alveoli.
Ответ:
It is Layer D
Explanation:
It would not be a because the first layer is not stratosphere but troposphere. It would not be b because layer b should be the stratosphere. It would not be c because layer c should be mesosphere not stratosphere. Which leads us to the only answer choice that is left answer choice D.