Which gland receives signals from the SCN to regulate circadian rhythms?

Which gland receives signals from the SCN to regulate circadian rhythms?

• A. Pineal Gland
• B. Pituitary Gland
• C. Thyroid Gland
• D. Adrenal Gland

Answer: (A)

The brain’s master clock, the SCN, coordinates daily rhythms by sending timing signals to downstream glands. The pineal gland is the recipient of these signals via sympathetic pathways, and it controls melatonin production. Melatonin rises at night, helping promote sleep and align the body's rhythms with the day-night cycle. Light exposure suppresses melatonin, adjusting the cycle to daytime. The other glands mentioned aren’t the primary receivers of SCN timing signals for circadian regulation; they’re involved in broader hormonal control rather than direkte circadian signaling. So the gland that receives SCN signals to regulate circadian rhythms is the pineal gland.

The brain’s master clock, the SCN, coordinates daily rhythms by sending timing signals to downstream glands. The pineal gland is the recipient of these signals via sympathetic pathways, and it controls melatonin production. Melatonin rises at night, helping promote sleep and align the body's rhythms with the day-night cycle. Light exposure suppresses melatonin, adjusting the cycle to daytime. The other glands mentioned aren’t the primary receivers of SCN timing signals for circadian regulation; they’re involved in broader hormonal control rather than direkte circadian signaling. So the gland that receives SCN signals to regulate circadian rhythms is the pineal gland.