Nervous System

4. A bundle of axons in the CNS
5. Type of neuroglia that the maintains the blood brain barrier to protect neurons
7. Another name for the end of the neuron (dendrite) that detects changes in the internal & external environment
8. A stimulus causes voltage-gated sodium ion (Na+) channels to open and the voltage increases to +40 mV
10. A group of neuron cell bodies in the PNS
13. The division of the nervous system that dominates when you are resting an ddigesting
18. There are usually many of the short extensions of neurons that detect stimuli
21. The functional unit of the nervous system that is specialized to transmit an electrical signal
23. The division of the nervous system that dominates when you are in a stressful situation
24. This can change the resting membrane potential
26. The division of the nervous system that tells skeletal muscles to contract
28. The voltage becomes more negative than the resting membrane potential
30. There are typically few of these long extensions of neurons that transmit an action potential
33. A type of neuroglia that makes and circulates cerebrospinal fluid
34. Type of neuroglia that wraps around axons in the CNS
35. The division of the nervous system that controls cardiac and smooth muscle and glands
36. The part of the nervous system that integrates and processes sensory input

1. Potassium ion (K+) leaves the cell and the voltage drops
2. A group of neuron cell bodies in the CNS
3. This type of matter is typically myelinated axons
4. The minimum amount of stimulus needed to cause an action potential
6. Another name for the muscle or gland that carries out the commands of the control center
9. A group of different types of cells that support neurons
11. At rest, the inside of a axon is slightly ___________
12. Neuroglia that cushion & protect neuron cell bodies in the PNS
14. The location on an axon where a action potential begins
15. The type of nerves that branch out of the brain
16. A bundle of axons in the PNS
17. The type of neuron that brings information into the back of the spinal cord
19. The type of neuron that connects sensory and motor neurons
20. This type of matter is typically neuron cell bodies
22. Cells that form a myelin sheath in the PNS
25. Type of neuroglia that wraps around and destroys pathogens & debris in the CNS
26. The sodium potassium pump sends three of these ions out with every turn
27. The resting membrane _______________ is -70 mV
29. The division of the peripheral nervous system that controls effectors
31. A fatty coat of insulation around the axon of a neuron
32. The end of an axon where neurotransmitters are located