IB Biology SL C3.1.11 Melatonin and Sleep Questions

Explore how darkness stimulates pineal melatonin, how light suppresses secretion and how circadian rhythms regulate sleep timing in IB Biology SL C3.1.11.

Exam points

Identify the pineal gland as the source of melatonin and explain that darkness or reduced light increases its secretion.
Explain or interpret how melatonin modulates circadian sleep timing, including jet-lag or screen-light effects.

[Maximum number: 1]

Which hormone regulates the hours of sleep and wakefulness?

A

Thyroxine

B

Insulin

C

Leptin

D

Melatonin

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