Nervous System

2. an involuntary, unplanned sequence or action and nearly instantaneous response to a stimulus
7. The part of the brain that is connected to the spinal cord
9. a momentary reversal in electrical potential across a plasma membrane (as of a neuron or muscle fiber) that occurs when a cell has been activated by a stimulus
10. a small structure within the brain located just above the brain stem between the cerebral cortex and the midbrain and has extensive nerve connections to both
11. a usually long and single nerve-cell process that usually conducts impulses away from the cell body
13. the insulating covering that surrounds an axon with multiple spiral layers of myelin, that is discontinuous at the nodes of Ranvier, and that increases the speed at which a nerve impulse can travel along an axon
15. a nitrogen-containing organic compound formed as an intermediate compound from dihydroxyphenylalanine (dopa) during the metabolism of the amino acid tyrosine
16. any of the usually branching protoplasmic processes that conduct impulses toward the body of a neuron
20. the nervous system outside the brain and spinal cord.
21. a component of the peripheral nervous system associated with the voluntary control of the body movements via the use of skeletal muscles
22. The portion of the brain in the back of the head between the cerebrum and the brain stem

1. the membrane potential of a cell that is not exhibiting the activity resulting from a stimulus
3. the nucleus-containing central part of a neuron exclusive of its axons and dendrites that is the major structural element of the gray matter of the brain and spinal cord, the ganglia, and the retina
4. endogenous chemicals that allow neurons to communicate with each other throughout the body
5. The lowest dose of a chemical at which a specified measurable effect is observed and below which it is not observed
6. the complex of nerve tissues that controls the activities of the body. In vertebrates it comprises the brain and spinal cord.
8. a component of the peripheral nervous system that regulates involuntary physiologic processes including heart rate, blood pressure, respiration, digestion, and sexual arousa
12. the outer layer that lies on top of your cerebrum
14. The area of the brain that controls body temperature, hunger, and thirst
17. he pathway that a reflex takes in the body
18. the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector)
19. The largest part of the brain