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Chapter 2 Neuroscience and Behavior Review 2.1: Neural Communication As Shay drives down the street, approaching a major intersection, the traffic signal changes to red. For her to perceive the change, light is transmitted to the backs of her eyes, where (1) sensory neurons can be activated. This information is received on branching fibers called (2) dendrites. When the signal reaches the cell body, if the (3) excitatory signals minus the (4) inhibitory signals exceed the neuron’s (5) threshold, gates on the neuron’s (6) axon open and allow (7) positively charged atoms to enter and (8) depolarize that part of the membrane. The resulting (9) action potential travels down the axon, which is often coated with an insulating sheath of (10) myelin that increases the speed of transmission. When the signal reaches the end of the axon, chemicals called (11) neurotransmitters are released into the (12) synaptic gap between the (13) sending and the (14) receiving neurons.