A night-shift worker experiences extreme difficulty falling asleep due to being exposed to bright lights during both night and day. The unusual pattern of light exposure is disturbing their ________, which controls the release of the hormone ________.

A. circadian rhythm; melatonin
B. metabolic rate; thyroxine
C. circulatory system; dopamine
D. limbic system; thymosin


Answer: A

Anatomy & Physiology

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