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Across 1. Time when a neuron is incapable of producing an action potential 3. Neurotransmitter which is excitatory in both the CNS and PNS 5. Type of refractory period when only a very strong stimulus can produce an action potential 6. Structure which insulates the nerve and prevents degradation of the AP 10. The larger the axon diameter, the _______ the action potential 12. The stimulus intensity of APs is caused by which type of modulation 13. Type of neuronal circuit when a signal is sent from one neuron to the next in line 18. Type of neuronal circuit when a signal will loop back on itself to create more signals 19. Neurotransmitter that primarily stimulates skeletal muscles 20. Transmission of an action potential along the length of an axon 21. Type of neuronal circuit when a signal comes from several neurons to a single neuron 22. The ______________ phenomenon states an AP either happens or it doesn't depending on whether the threshold is reached or not 23. ________ conduction is when an AP jumps from one Node of Ranvier to another Node of Ranvier 24. Type of chemical synapse when a neurotransmitter hyperpolarizes a post-synaptic membrane 25. Bare spots on the action between sections of myelin sheath

Down 2. Type of neuronal circuit when a signal moves across many neurons at the same time 3. Neurotransmitters which cause both excitatory and inhibitory effects in the CNS 4. Stimulus intensity in which the height of the waves vary 7. Type of synapse when neurons are connected by bridged junctions to permit rapid transmission of an AP 8. Neurotransmitter which is a vasodilator for cerebral blood flow 9. Type of refractory period when an action potential cannot be generated, regardless of the strength 10. Stimulus intensity in which the number of waves vary per unit time 11. Neurotransmitter which functions in emotional behavior and biological clock 14. Type of neuronal circuit when a signal spreads from few neurons to many neurons 15. Type of synapse when neurotransmitters carry the signal 16. Neurotransmitters which are important mediators of pain signals 17. Type of chemical synapse when a neurotransmitter depolarizes a post-synaptic membrane 23. Lateral movement of an action potential is caused by ______ moving away from the area of depolarization