Which of the following is true for hormones but not neurotransmitters?
A. They are signalling chemicals found in animals
B. They act on distant target cells
C. They are transmitted across a synaptic gap
D. They result in a short-term effect
参考答案: B
本题详细解析: B
Choice B is correct because hormones are secreted into the blood and are transported by the plasma to act on distant target cells.
Choice A is incorrect because both hormones and neurotransmitters are signalling chemicals found in animals. Choices C and D are incorrect because these are characteristics of neurotransmitters and not hormones. Hormones are transported by the blood, and they result in long-term effects.
