What are the three processes involved in reducing the concentration of a chemical substance in the body?

What are the three processes involved in reducing the concentration of a chemical substance in the body?

• A. Excretion, Exhalation, and Evaporation
• B. Metabolism, detoxification, excretion
• C. Metabolism, Absorption, Excretion
• D. Detoxification, Sequestration, Excretion

Answer: (B)

Reducing the amount of a chemical in the body comes from transforming it into forms that are easier to eliminate, neutralizing its harmful potential, and then removing it from the body. Metabolism drives the chemical transformations that usually make substances more water-soluble. Detoxification refers to the body’s ability to render toxins less harmful through these metabolic changes, often enabling subsequent excretion. Excretion is the actual elimination step, removing the substance from the body via the kidneys, bile, lungs, and other routes. Putting these together, metabolism, detoxification, and excretion provide a complete framework for lowering internal concentrations. The other options don’t fit as generally applicable mechanisms. Exhalation and evaporation describe routes for some volatiles but aren’t universal processes for reducing body burden. Absorption is the opposite of reduction, since it increases internal concentration. Sequestration implies storage within tissues and doesn’t by itself ensure removal or reduction of circulating levels.

Reducing the amount of a chemical in the body comes from transforming it into forms that are easier to eliminate, neutralizing its harmful potential, and then removing it from the body. Metabolism drives the chemical transformations that usually make substances more water-soluble. Detoxification refers to the body’s ability to render toxins less harmful through these metabolic changes, often enabling subsequent excretion. Excretion is the actual elimination step, removing the substance from the body via the kidneys, bile, lungs, and other routes.

Putting these together, metabolism, detoxification, and excretion provide a complete framework for lowering internal concentrations.

The other options don’t fit as generally applicable mechanisms. Exhalation and evaporation describe routes for some volatiles but aren’t universal processes for reducing body burden. Absorption is the opposite of reduction, since it increases internal concentration. Sequestration implies storage within tissues and doesn’t by itself ensure removal or reduction of circulating levels.