This image depicts three of the key components involved in regulating your internal biological clock. Pick the alternative that correctly labels the structures in the drawing.
A)1 = pituitary gland, 2 = pineal gland, 3 = melatonin pathway
B)1 = hypothalamus, 2 = optic chiasm, 3 = beta neural pathway
C)1 = thalamus, 2 = circadian center, 3 = bipolar optic pathway
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 alternative that correctly labels the structures in the drawing. 
A)1 = pituitary gland, 2 = pineal gland, 3 = melatonin pathway 
B)1 = hypothalamus, 2 = optic chiasm, 3 = beta neural pathway 
C)1 = thalamus, 2 = circadian center, 3 = bipolar optic pathway 
D)1 = pineal gland, 2 = suprachiasmatic nucleus, 3 = optic nerve

Quizplus · Accepted Answer

1) The structure labeled as 1 in the image is the pineal gland, which is responsible for secreting the hormone melatonin.
2) The structure labeled as 2 is the suprachiasmatic nucleus (SCN), which is located in the hypothalamus and plays a key role in regulating the circadian rhythm.
3) The structure labeled as 3 is the optic nerve, which transmits visual information from the eyes to the brain.

This Image Depicts Three of the Key Components Involved in Regulating