| 1. | By releasing neurotransmitters across the synaptic cleft | 
| 2. | Through the direct movement of ions via gap junctions | 
| 3. | By synaptic vesicles fusing with the postsynaptic membrane | 
| 4. | Through saltatory conduction at the nodes of Ranvier. | 
| I: | Chemical synapses use neurotransmitters to transmit impulses. | 
| II: | Nodes of Ranvier are gaps in the myelin sheath of axons. | 
| III: | The occipital lobe is associated with processing visual information. | 
| IV: | The temporal lobe is involved in processing auditory information. | 
| V: | The spinal cord is responsible for voluntary actions. |