Oxygen and carbon dioxide pass across the alveolar membrane in the lungs through a process called

Oxygen and carbon dioxide pass across the alveolar membrane in the

lungs through a process called Diffusion.

Diffusion is defined as the movement of molecules from a region of higher

concentration to a lower concentration through a semi-permeable

membrane.

The alveolar membrane serves as the semi-permeable membrane in

which the oxygen and carbon dioxide pass through.

Read more about Diffusion here link

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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.