Examlex
In the PEST model of the business environment, the "S" represents which of the following concepts?
Nasopharynx
The nasopharynx is the upper part of the pharynx, connecting the nasal cavity above to the mouth and larynx below.
Simple Squamous Epithelium
A single layer of flat cells lining surfaces involved in passive diffusion, such as the lining of blood vessels and air sacs of the lungs.
Alveoli
Tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place.
Alveolar Ducts
Tiny ducts in the lungs that connect the bronchioles and alveolar sacs, facilitating gas exchange.
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