问题描述：
[单选]
以下哪一项是睫状肌（M3受体）在聚焦近物体时收缩的主要第二信使过程？Which of the following is the primary second-messenger process in the contraction of the ciliary muscle （M3 receptor） when focusing on near objects ？
A．cAMP
B．cGMP
C．Depolarizing influx of sodium ions via channel
D．IP3
E．NO
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上一篇：下列哪项特征描述了副交感神经系统？Which of the following features describes the parasympathetic nervous system？
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