Biology Nervous Coordination SZABMU 2024 Reconduct
PMDC Verified Question 9 of 86
Sleep wake cycle is controlled by which part of brain?
A
Hippocampus
B
Thalamus
C
Hypothalamus
D
Amygdalae
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Hypothalamus
Concept:

Biological rhythms must be synchronized with external light cues to maintain homeostasis.

Solution:

  • The hypothalamus contains a specialized cluster of neurons called the suprachiasmatic nucleus (SCN). The SCN acts as the body's master circadian clock, receiving light data from the eyes to heavily regulate the 24-hour sleep-wake cycle.


Why other options are incorrect:

  • Thalamus: Blocks sensory input during sleep, but the hypothalamus dictates the rhythmic cycle itself.


  • Hippocampus / Amygdala: Involved in memory and emotions, completely separate from circadian rhythm control.

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