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

Across 3. is the most common type of neurotransmitter, and the most well understood; activates muscles that help the body move; involved in breathing, attention, arousal, motivation 10. is a chemical or drug that binds to receptors in the brain and prevents an agonist from having a reaction 12. refers to the change in membrane potential that returns it to a negative value just after the depolarization phase of an action potential which has changed the membrane potential to a positive value 13. part of the neural membrane opens to allow positively charged ions inside the cell and negatively charged ions out (2 Words) 14. is a neurotransmitter; responsible for memory, sleep, mood, pleasurable, reward, behavior, cognition 15. the insulating layer around many axons that increases the speed of conduction of nerve impulses (2 Words)

Down 1. is the reabsorption of a neurotransmitter by a neurotransmitter transporter located along the plasma membrane of an axon terminal (i.e., the pre-synaptic neuron at a synapse) or glial cell after it has performed its function of transmitting a neural impulse 2. the electric potential across the plasma membrane of a neuron when it is in the nonexcited, or resting, state (2 Words) 4. neurotransmitters that are released in our brain to reduce pain and make us feel good 5. refers to the brain's ability to change and adapt as a result of experience 6. the minute space between the cell membrane of an axon terminal and of the target cell with which it synapses (2 Words) 7. are neurons that are found exclusively in the central nervous system 8. is the process by which new neurons are formed in the brain 9. a reduction in the electric potential across the plasma membrane of a cell, especially a neuron, such that the inner surface of the membrane becomes less negative in relation to the outer surface 11. a drug or other chemical agent that binds to a particular receptor and produces a physiological effect, typically one similar to that of the body's own neurotransmitter at that receptor