Injections of the serotonin precursor,5-hydroxytryptophan,

Question

Quizplus · Accepted Answer

The passage states that injections of 5-hydroxytryptophan reverse the insomnia produced in cats or rats by the serotonin antagonist PCPA. Therefore, choice (A) is the correct answer. Option (B) is incorrect as it states that injections of 5-hydroxytryptophan reverse sleep increases produced in mice by PCPA, which is not mentioned in the passage. Similarly, option (C) and (D) are incorrect as the passage does not mention the effectiveness of injections of 5-hydroxytryptophan in the treatment of human insomnia or hypersomnia, respectively. Option (E) is also incorrect as it refers to the reversal of delta sleep increases produced by sleep reduction in volunteers, which is not related to the effects of injections of 5-hydroxytryptophan mentioned in the passage.

Injections of the Serotonin Precursor,5-Hydroxytryptophan