CIH Toxicology and Chemical Hazards 5

Question 1

A worker exposed to beryllium dust develops granulomatous lung disease years after leaving the job. This pattern is consistent with:

Accepted Answer

Chronic beryllium disease (berylliosis), an immune-mediated sensitization response

Answer

Chronic beryllium disease is an immune-mediated granulomatous lung condition that can develop years after beryllium sensitization, even after exposure has ceased.

Question 2

Which route of exposure typically results in the fastest onset of systemic toxic effects?

Accepted Answer

Intravenous injection

Answer

Intravenous injection delivers a substance directly into the bloodstream, producing the fastest onset of systemic effects with 100% bioavailability.

Question 3

The concept of a 'threshold' in toxicology implies that:

Accepted Answer

Below a certain dose, no adverse effect is expected to occur

Answer

The threshold concept holds that there is a dose below which no adverse effect occurs because biological defense mechanisms can handle the insult.

Question 4

Hexane exposure in industrial settings is primarily associated with which occupational disease?

Accepted Answer

Peripheral neuropathy (n-hexane neuropathy)

Answer

n-Hexane is metabolized to 2,5-hexanedione, which causes peripheral neuropathy by cross-linking neurofilament proteins in axons.

Question 5

When assessing mixture toxicity for chemicals acting by the same mechanism, industrial hygienists apply the concept of:

Accepted Answer

Dose addition (additive toxicity) to evaluate combined exposure

Answer

For chemicals with similar mechanisms of action, dose addition is applied, meaning their combined effect equals the sum of their proportional contributions to the TLV.

CIH - Certified Industrial Hygienist Exam Practice Test

CIH - Certified Industrial Hygienist Exam Practice Test

CIH Toxicology and Chemical Hazards 5