Multiple choice

Which endocrine gland is responsible for our biological clock?

  1. Thyroid Gland

  2. Hypothalamus

  3. Pineal Gland

  4. Ovaries

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pineal gland is responsible for regulating our biological clock (circadian rhythm) by secreting the hormone melatonin in response to light-dark cycles.