Multiple Choice
Why might increasing levels of tryptophan in the blood not increase brain serotonin levels?
A) It doesn't matter how much tryptophan is present, serotonin is made at a constant rate from brain stores of tryptophan.
B) Tryptophan cannot cross the blood-brain barrier under any circumstances.
C) Tryptophan competes with other amino acids for transport across the blood-brain barrier.
D) Insulin is required for transport of tryptophan across the blood-brain barrier.
Correct Answer:
Verified
Correct Answer:
Verified
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