如图为某类突触的信号传递示意图，这类突触中特定的神经递质一多巴胺的释放，会刺激大脑中的“奖赏”中枢，使人产生愉悦感，过后多巴胺会被转运载体转运回细胞。
请据图分析回答：
(1)图中①是__________，其中的多巴胺是从__________通过__________方式释放到突触间隙中。
(2)当多巴胺与__________结合，能使突触后膜兴奋，后膜电位变为__________。
(3)可卡因是一种神经类毒品，由图可知，其进入突触间隙后会影响__________过程，使突触后神经元__________，导致大脑“奖赏”中枢获得愉悦感，最终造成人对可卡因产生依赖的不良后果。
正确答案及解析
正确答案
解析
(1)突触小泡；突触前膜；胞吐。
(2)(特异性)受体；外负内正。
(3)多巴胺转运回细胞(多巴胺的回收)；持续兴奋。
解析：突触结构包括突触前膜、突触间隙和突触后膜；神经递质由突触前膜释放作用于突触后膜，使得下一个神经元兴奋或者抑制。
(1)图中的①是突触小泡，形成与高尔基体有关，当神经末梢有神经冲动传来时，突触前膜的突触小泡受到刺激，与突触前膜融合，以胞吐的方式释放神经递质，体现细胞膜的流动性。
(2)神经递质扩散通过突触间隙，与突触后膜上特异性的受体结合，使得突触后膜上电位变成外负内正，引起下一个神经元兴奋。
(3)据图分析，可卡因在突触间隙中，使得多巴胺转运回细胞，而没有分解失去活性，使得神经元持续兴奋。
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