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Across 2. movement from an area of higher concentration to lower concentration is movement down this 6. these receptors are associated with signal proteins and G proteins 7. the period during which it is impossible to elicit an additional action potential 8. the abbreviation for sodium ions minus the charge 10. the massive but momentary reversal of the membrane potential 11. this catecholamine is made from tyrosine 12. specialized pores in the cellular membrane 13. the steady membrane potential of about -70 mV 17. ion channels that open or close in response to changes in the level of the membrane potential 18. action potentials have this type of response 19. the transmission of action potentials in myelinated axons 21. a decrease in the resting membrane potential from -70 to -67 mV 22. postsynaptic depolarizations are recognized by this acronym 23. action potentials that decrease in amplitude as they travel through the neuron are said to be 24. this is a mechanism for terminating neurotransmitter action in the synapse: not enzymatic degradation 25. the abbreviation for potassium ions minus the charge 27. conduction in these types of neurons is typically passive and weaken over time 28. the magnitude of a wave's oscillation (e.g., sound, electrical pulse, etc.) 29. the synapse created by a terminal button on a dendrite

Down 1. neurons that release this neurotransmitter are said to be cholinergic 3. the type of pressure created from the resting membrane potential 4. the difference in electrical charge between the inside and the outside of a cell 5. one of the four monoamine neurotransmitters 9. serotonin, norepinephrine, epinephrine, and dopamine are in this category of neurotransmitters 14. postsynaptic hyperpolarizations are known by this acronym 15. the most prevalent inhibitory neurotransmitter 16. the conduction of action potentials along an axon 20. these receptors are associated with ligand-activated ion channels 26. amplitudes proportional to the intensity of the signal that elicited them