Nervous System

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Across
  1. 4. A bundle of axons in the CNS
  2. 5. Type of neuroglia that the maintains the blood brain barrier to protect neurons
  3. 7. Another name for the end of the neuron (dendrite) that detects changes in the internal & external environment
  4. 8. A stimulus causes voltage-gated sodium ion (Na+) channels to open and the voltage increases to +40 mV
  5. 10. A group of neuron cell bodies in the PNS
  6. 13. The division of the nervous system that dominates when you are resting an ddigesting
  7. 18. There are usually many of the short extensions of neurons that detect stimuli
  8. 21. The functional unit of the nervous system that is specialized to transmit an electrical signal
  9. 23. The division of the nervous system that dominates when you are in a stressful situation
  10. 24. This can change the resting membrane potential
  11. 26. The division of the nervous system that tells skeletal muscles to contract
  12. 28. The voltage becomes more negative than the resting membrane potential
  13. 30. There are typically few of these long extensions of neurons that transmit an action potential
  14. 33. A type of neuroglia that makes and circulates cerebrospinal fluid
  15. 34. Type of neuroglia that wraps around axons in the CNS
  16. 35. The division of the nervous system that controls cardiac and smooth muscle and glands
  17. 36. The part of the nervous system that integrates and processes sensory input
Down
  1. 1. Potassium ion (K+) leaves the cell and the voltage drops
  2. 2. A group of neuron cell bodies in the CNS
  3. 3. This type of matter is typically myelinated axons
  4. 4. The minimum amount of stimulus needed to cause an action potential
  5. 6. Another name for the muscle or gland that carries out the commands of the control center
  6. 9. A group of different types of cells that support neurons
  7. 11. At rest, the inside of a axon is slightly ___________
  8. 12. Neuroglia that cushion & protect neuron cell bodies in the PNS
  9. 14. The location on an axon where a action potential begins
  10. 15. The type of nerves that branch out of the brain
  11. 16. A bundle of axons in the PNS
  12. 17. The type of neuron that brings information into the back of the spinal cord
  13. 19. The type of neuron that connects sensory and motor neurons
  14. 20. This type of matter is typically neuron cell bodies
  15. 22. Cells that form a myelin sheath in the PNS
  16. 25. Type of neuroglia that wraps around and destroys pathogens & debris in the CNS
  17. 26. The sodium potassium pump sends three of these ions out with every turn
  18. 27. The resting membrane _______________ is -70 mV
  19. 29. The division of the peripheral nervous system that controls effectors
  20. 31. A fatty coat of insulation around the axon of a neuron
  21. 32. The end of an axon where neurotransmitters are located