1						2	3		4
						5
															6
						7		8
		9						10
11
												12
					13
												14
					15
											16
								17

Across 2. An inhibitory neurotransmitter 5. An acetylcholine antagonist that blocks release of acetylcholine from the neuromuscular junction 8. Receptor type located on the presynaptic, rather than the postsynaptic membrane 11. The process of neurotransmitter release 12. _______ refractory period; a brief period after an action potential during which it is impossible to elicit a second one 13. Mechanisms in the membrane of a cell that actively transport ions or molecules across the membrane 15. After a neurotransmitter is released it is drawn back into the presynaptic button by this process 16. Positively and negatively charged particles 17. ______-activated ion channels are channels that open or close in response to changes in the level of the membrane potential

Down 1. One of the ion types involved in the action potential 3. The abbreviation for acetylcholine 4. A massive but momentary reversal of the membrane potential 6. ____ receptors are associated with G proteins 7. Make more positive 9. The neurotransmitter norepinephrine is synthesized from this other neurotransmitter 10. A molecule that binds to another e.g. a neurotransmitter is this of its receptor 11. Excitatory postsynaptic potential 14. ________ summation; postsynaptic potentials produced in rapid succession at the same synapse sum to form a greater signal