Deterministic effects have what dose-response characteristic?

Deterministic effects have what dose-response characteristic?

• A. Deterministic effects require a threshold dose
• B. Deterministic effects have no threshold
• C. They can appear only months after exposure
• D. They are independent of dose

Answer: (A)

Deterministic effects are tissue reactions that only occur once the absorbed dose to a tissue exceeds a certain level. That threshold exists because the damage must accumulate beyond the tissue’s capacity to repair; below that level, cells can usually recover and no effect is observed. Once the dose passes the threshold, the chance of seeing the effect increases with higher dose, and the severity of the effect tends to rise as well. This dose-dependent threshold behavior distinguishes deterministic effects from stochastic ones, where risk increases with dose but there isn’t a true, fixed threshold and severity isn’t tied to dose in the same way.

Deterministic effects are tissue reactions that only occur once the absorbed dose to a tissue exceeds a certain level. That threshold exists because the damage must accumulate beyond the tissue’s capacity to repair; below that level, cells can usually recover and no effect is observed. Once the dose passes the threshold, the chance of seeing the effect increases with higher dose, and the severity of the effect tends to rise as well. This dose-dependent threshold behavior distinguishes deterministic effects from stochastic ones, where risk increases with dose but there isn’t a true, fixed threshold and severity isn’t tied to dose in the same way.