Multiple choice

Melatonin ______.

  1. triggers estrous in healthy rats

  2. inhibits estrous in healthy rats

  3. cannot prevent estrous in light induced estrous rats

  4. has no effect on estrous cycle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Melatonin inhibits estrous (reproductive cycle) in healthy rats, particularly in response to longer dark periods (winter conditions). Melatonin is secreted by the pineal gland in response to darkness and regulates seasonal reproductive cycles in many mammals. It can suppress estrous in light-induced constant estrous rats by maintaining natural photoperiodic signaling.

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