What specific type of epithelial tissue lines the trachea? What two types of epithelial tissue line the alveoli of the lungs? What is the physiologic importance each of these types of epithelia?

1.The epithelium lining the trachea is typical respiratory epithelium (ciliated pseudostratified columnar) that contains numerous goblet cells.

2. Lung alveoli are lined by very thin simple squamous epithelium.

3. protection, sensory reception, excretion, filtration, absorption and secretion

Explanation:

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.