Nervous System

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Across
  1. 2. Your body's command center
  2. 3. A signaling molecule secreted by a neuron to affect another cell across a synapse
  3. 4. Pore-forming membrane proteins that allow ions to pass through the channel pore
  4. 5. A bulb at the end of an axon in which neurotransmitter molecules are stored and released.
  5. 6. Determined by the uneven distribution of ions (charged particles) between the inside and the outside of the cell
  6. 7. Stimuli that are received by sensory structures are communicated to the nervous system where that information is processed
  7. 10. An enzyme found in the membrane of all animal cells that lets sodium out and potassium in
  8. 13. The portion of a nerve cell (neuron) that carries nerve impulses away from the cell body
  9. 14. A structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber
  10. 16. The space in between the axon of one neuron and the dendrites of another and is where the electrical signal is translated to a chemical signal that can be perceived by the next neuron
  11. 17. The relatively short-lived activated cells that defend the body in an immune response
  12. 22. The response in a sensory organ (eyes, ears, nose, tongue, and skin) when it receives stimuli
  13. 25. A relatively static membrane potential which is usually referred to as the ground value for trans-membrane voltage
  14. 27. Any neuron having its cell body, axon, and dendrites entirely within the central nervous system
  15. 29. The gaps formed between the myelin sheath where the axons are left uncovered
  16. 30. Action that is performed as a response to a stimulus and without conscious thought
Down
  1. 1. A class of transmembrane proteins that form ion channels that are activated by changes in the electrical membrane potential near the channel
  2. 8. A rapid sequence of changes in the voltage across a membrane
  3. 9. An insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord
  4. 11. Any of the usually branching extensions of a neuron over which impulses travel toward the cell body
  5. 12. An action performed by the activation of motor units in skeletal muscles under control of signaling from motor neurons
  6. 15. The nervous system outside the brain and spinal cord
  7. 18. a thing or event that evokes a specific functional reaction in an organ or tissue.
  8. 19. The brain and spinal cord
  9. 20. The spherical part of the neuron that contains the nucleus and connects to the dendrites, which bring information into the neuron, and the axon, which sends information to other neurons
  10. 21. Cells in the brain and spinal cord that allow us to move, speak, swallow and breathe by sending commands from the brain to the muscles that carry out these functions
  11. 23. A whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs
  12. 24. The nerve cells that are activated by sensory input from the environment
  13. 26. The fundamental units of the brain and nervous system
  14. 28. The connective tissue of the nervous system, consisting of several different types of cell associated with neurons