Which term is used to describe the study of the harmful effects of substances on health?

Which term is used to describe the study of the harmful effects of substances on health?

• A. Hazard
• B. Exposure science
• C. Epidemiology
• D. Toxicology

Answer: (D)

The study of the harmful effects of substances on health is toxicology. Toxicology focuses on how chemicals, drugs, and other agents cause injury, disease, or death in living systems, including how dose, exposure duration, and route influence effects. It covers mechanisms of action at the cellular and molecular levels, as well as how the body absorbs, distributes, metabolizes, and eliminates toxicants (toxicokinetics and toxicodynamics). This field directly addresses why a substance is harmful and under what conditions harm occurs. Hazard describes the inherent potential of a substance to cause harm, not the study of its effects. Exposure science looks at the amount and contact with the substance, which informs risk but isn’t specifically about the adverse health outcomes themselves. Epidemiology studies patterns and determinants of health in populations and can examine associations between exposures and disease, but it isn’t the discipline that focuses on the biological mechanisms of toxicity.

The study of the harmful effects of substances on health is toxicology. Toxicology focuses on how chemicals, drugs, and other agents cause injury, disease, or death in living systems, including how dose, exposure duration, and route influence effects. It covers mechanisms of action at the cellular and molecular levels, as well as how the body absorbs, distributes, metabolizes, and eliminates toxicants (toxicokinetics and toxicodynamics). This field directly addresses why a substance is harmful and under what conditions harm occurs.

Hazard describes the inherent potential of a substance to cause harm, not the study of its effects. Exposure science looks at the amount and contact with the substance, which informs risk but isn’t specifically about the adverse health outcomes themselves. Epidemiology studies patterns and determinants of health in populations and can examine associations between exposures and disease, but it isn’t the discipline that focuses on the biological mechanisms of toxicity.