The diagram shows the sequence of events occurring as an action potential arrives at a synapse. The numbered arrows represent the movement of substances across the membranes. What are the substances moving across the membranes?

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The diagram shows the sequence of events occurring as an action potent

1.	The diagram shows the sequence of events occurring as an action potential arrives at a synapse. The numbered arrows represent the movement of substances across the membranes. What are the substances moving across the membranes?
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B.	\[{{K}^{+}}\]\[N{{a}^{+}}\]\[{{K}^{+}}\]\[C{{a}^{2+}}\]Ach.
C.	\[N{{a}^{+}}\]\[{{K}^{+}}\]\[C{{a}^{2+}}\]Ach.\[N{{a}^{+}}\]
D.	\[N{{a}^{+}}\]\[{{K}^{+}}\]\[N{{a}^{+}}\]Ach.\[C{{a}^{2+}}\]
Answer» D. \[N{{a}^{+}}\]\[{{K}^{+}}\]\[N{{a}^{+}}\]Ach.\[C{{a}^{2+}}\]