问题描述：
[单选]
香烟中的尼古丁通过结合某些受体刺激人体的许多细胞。哪一种描述了尼古丁与目标受体结合时的反应？The nicotine of cigarettes stimulates many cells in human body by binding certain receptors． Which describes the response when nicotine binds its target receptor？
A．通道开放阴离子内流A channel opens and negative ions flow into the cell
B．通道开放阳离子内流A channel opens and positive ions flow into the cell
C．腺苷酸环化酶激活胞内cAMP增加Adenylyl cyclase is activated to increase intracellular cAMP
D．腺苷酸环化酶抑制胞内cAMP降低Adenylyl cyclase is inhibited leading to decreased intracellular cAMP
E．激活磷脂酶C增加胞内IP3和DAG。Phospholipase C is activated to increase intracellular IP3 and DAG
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上一篇：交感神经、副交感神经和躯体神经系统的共性涉及下列哪一种神经效应递质？Commonalities of the sympathetic， parasympathetic， and somatic nervous systems involve which of the following neuroeffector transmitters？
下一篇：乙酰胆碱被AChE迅速水解，作用时间为（）？Acetylcholine is rapidly hydrolyzed by AChE and it’s duration of action is（）？
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