Construction Health and Safety Technician (CHST) 2026 – 400 Free Practice Questions to Pass the Exam

A neurotoxin is specifically defined as a substance that causes poisoning of the brain and nervous system. Neurotoxins can interfere with the normal functioning of neurons and other cells within the nervous system, leading to a range of harmful effects that may include cognitive deficits, motor skill impairment, and other neurological dysfunctions. These substances can disrupt communication between nerve cells, leading to symptoms that can vary depending on the type of neurotoxin and the level of exposure.

The other options do not accurately describe a neurotoxin. For instance, a substance causing skin irritation pertains to irritants rather than neurotoxic effects. Likewise, substances that negatively affect vision are generally classified as ophthalmic toxins or visual toxins, not neurotoxins specifically. Finally, a substance that is harmless to human health would not be classified as a neurotoxin at all, since the defining characteristic of neurotoxins is their potential to cause harm to the nervous system.