This image depicts three of the key components involved in regulating your internal biological clock. Pick the answer choice that correctly labels the structures in the drawing.

A) 1, suprachiasmatic nucleus. 2, pineal gland. 3, melatonin pathway
B) 1, hypothalamus; 2, amygdala; 3, pineal gland
C) 1, thalamus; 2, pineal gland; 3, suprachiasmatic nucleus
D) 1, pineal gland; 2, suprachiasmatic nucleus; 3, optic nerve

Question

This image depicts three of the key components involved in regulating your internal biological clock. Pick the answer choice that correctly labels the structures in the drawing.

A) 1, suprachiasmatic nucleus. 2, pineal gland. 3, melatonin pathway 
B) 1, hypothalamus; 2, amygdala; 3, pineal gland 
C) 1, thalamus; 2, pineal gland; 3, suprachiasmatic nucleus 
D) 1, pineal gland; 2, suprachiasmatic nucleus; 3, optic nerve

Quizplus · Accepted Answer

The pineal gland is labeled as 1, the suprachiasmatic nucleus is labeled as 2, and the optic nerve is labeled as 3. The pineal gland secretes melatonin, which is involved in regulating sleep-wake cycles, and is controlled by signals from the suprachiasmatic nucleus. The suprachiasmatic nucleus acts as the master clock in the brain and receives input from the optic nerve, which helps to synchronize the clock with environmental cues such as light and dark.

This Image Depicts Three of the Key Components Involved in Regulating