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Questions and Answers
Which gland synthesizes the hormone melatonin from the neurotransmitter serotonin?
Which gland synthesizes the hormone melatonin from the neurotransmitter serotonin?
- Pineal gland (correct)
- Hypothalamus
- Thyroid gland
- Pituitary gland
What enzyme is the rate-limiting factor for melatonin synthesis?
What enzyme is the rate-limiting factor for melatonin synthesis?
- Serotoninase
- N-acetyltransferase (correct)
- Melatoninase
- Tryptophanase
What inhibits the synthesis of melatonin?
What inhibits the synthesis of melatonin?
- Light (correct)
- Darkness
- Serotonin
- Tryptophan
Which neurotransmitter is melatonin synthesized from?
Which neurotransmitter is melatonin synthesized from?
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What may help evoke day-night entrainment of the SCN 24- to 25-hour clock?
What may help evoke day-night entrainment of the SCN 24- to 25-hour clock?
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Study Notes
Melatonin Synthesis
- The pineal gland synthesizes the hormone melatonin from the neurotransmitter serotonin.
Rate-Limiting Factor
- The enzyme N-acetyltransferase is the rate-limiting factor for melatonin synthesis.
Inhibition of Melatonin Synthesis
- Norepinephrine inhibits the synthesis of melatonin.
Melatonin Synthesis from Neurotransmitter
- Melatonin is synthesized from the neurotransmitter serotonin.
Day-Night Entrainment
- Exposure to bright light and dark cycles may help evoke day-night entrainment of the SCN (suprachiasmatic nucleus) 24- to 25-hour clock.
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Description
Test your knowledge of the circadian rhythm and biological clock with this quiz. Explore topics such as retinal cells, retinohypothalamic tract, SCN, pineal gland, and their roles in regulating the body's internal clock.
