Which of the following anatomical structures is responsible for regulating the circadian rhythm?
A) Amygdala
B) Pineal gland
C) Hippocampus
D) Thalamus
E) Corpus callosum
IMAT 2023 · Question 21
Q21 - Hormonal axes and endocrine control
Pinned
The correct answer is B) Pineal gland.
The pineal gland releases melatonin at night, and that is what keeps the body's day–night rhythm in step. Strictly, the master clock is the suprachiasmatic nucleus in the hypothalamus, which tells the pineal gland when to release melatonin, but the SCN isn't one of the options.
The amygdala (emotion), hippocampus (memory), thalamus (relay to the cortex) and corpus callosum (connects the hemispheres) aren't involved in setting the rhythm.
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