Increasing tryptophan helps the brain produce ____, which induces sleepiness.
A) glucose
B) phenylalanine
C) melatonin
D) lactose

Question

Quizplus · Accepted Answer

Tryptophan is an essential amino acid that is a precursor for the neurotransmitter serotonin. Serotonin is ultimately converted to melatonin, which regulates sleep-wake cycles. Therefore, increasing tryptophan levels can help the brain produce melatonin, leading to sleepiness. Glucose, phenylalanine, and lactose are unrelated to this process.

Increasing Tryptophan Helps the Brain Produce ____, Which Induces Sleepiness