During inspiration thoracic cavity volume increases. a. true b. false

True

Explanation:

Inspiration is the process of inhaling air from the nose that reaches the lungs through respiratory tract. Expiration is the release of air from the lungs to the outside environment through the nose.

During inspiration, the ribs move up and out, diaphragm moves up or inferiorly, the external intercoastals contract and the thoracic cavity increases in volume for the air to come in. During expiration, the opposite of inspiration occurs. Both inspiration and expiration are related.

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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.