The primary toxicity of pulmonary agents is to the and follows of smoke, particles, vapors, or gases

The primary toxicity of pulmonary agents is to the airway and follows inhalation of smoke, particles, vapors, or gases

Explanation:

Toxic substances which are in the form of gases, dust, vapors, fumes, fibers, etc. are able to penetrate organisms by inhalation through both the upper airways and the alveoli.

The respiratory system consists of the upper airways and the lungs.

The pathway of toxic substances through the respiratory system will depend on the body's reaction to these agents. Toxic substances are often grouped into particles and, depending on their size, do not even reach all the respiratory compartments.

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it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.