Examlex
Which of the following is a different concept from the other three?
Genital Arousal
Physiological reactions of the genital organs in response to sexual stimulation, leading to increased blood flow and erection or lubrication.
Suprachiasmatic Nucleus
A part of the brain located in the hypothalamus that regulates circadian rhythms.
Circadian Rhythm
A natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours, affecting physical, mental, and behavioral changes in living organisms.
Pineal Gland
A small, pine-cone-shaped endocrine gland in the brain that produces and secretes the hormone melatonin, which regulates sleep patterns.
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