What term describes exposure to a small dose over a long time?

What term describes exposure to a small dose over a long time?

• A. Chronic
• B. Acute
• C. Subchronic
• D. Acute-on-chronic

Answer: (A)

Chronic exposure describes receiving a small amount of a pollutant over an extended period. When the dose is low but present or repeated for a long time, effects may accumulate and manifest gradually, rather than appearing quickly. Acute exposure is the opposite: a high dose over a short time, causing immediate effects. Subchronic refers to exposure for a moderate duration—longer than acute but shorter than chronic. Acute-on-chronic means an acute event layered on top of ongoing chronic exposure. In the scenario of a small dose over a long time, chronic is the best fit.

Chronic exposure describes receiving a small amount of a pollutant over an extended period. When the dose is low but present or repeated for a long time, effects may accumulate and manifest gradually, rather than appearing quickly.

Acute exposure is the opposite: a high dose over a short time, causing immediate effects. Subchronic refers to exposure for a moderate duration—longer than acute but shorter than chronic. Acute-on-chronic means an acute event layered on top of ongoing chronic exposure. In the scenario of a small dose over a long time, chronic is the best fit.