Asked by Brian Storme on May 10, 2024
Verified
The most significant environmental cue that plays a role in circadian rhythms is __________
A) loud noise.
B) extreme heat.
C) hunger.
D) bright light.
Circadian Rhythms
Natural, internal processes that regulate the sleep-wake cycle and repeat roughly every 24 hours, influencing physiological and behavioral changes.
Bright Light
High-intensity, visible light, often used in light therapy to treat various conditions, including seasonal affective disorder and certain sleep disorders.
- Examine the influence of environmental signals on the body's circadian rhythms.
Verified Answer
ST
Serhii TarkanovskyiMay 11, 2024
Final Answer :
D
Explanation :
Bright light, specifically blue light, is the most significant environmental cue that plays a role in circadian rhythms. The eyes contain photoreceptor cells that are sensitive to light and signal the suprachiasmatic nucleus (SCN) in the brain, which regulates the body's internal clock. Blue light, which is abundant in sunlight and electronic devices, suppresses the production of melatonin, a hormone that promotes sleep, and stimulates wakefulness. This is why exposure to blue light before bedtime can disrupt sleep and lead to circadian rhythm disorders.
Learning Objectives
- Examine the influence of environmental signals on the body's circadian rhythms.
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