The Nervous and Endocrine System

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Across
  1. 4. Time after action potential where neuron is unable to have another action potential
  2. 6. Receive messages from other cells
  3. 8. Carry information away from CNS (output/motor)
  4. 12. Carry information from sensory receptors to brain and spinal cord
  5. 15. Neurons within brain and spinal cord that communicate internally
  6. 16. Blocks receptor sites and decreases action of neurotransmitter
  7. 17. Carry signal towards CNS (input/sensory)
  8. 18. Intersection between axon tip of sending neuron and dendrite of receiving neuron
  9. 20. Molecular and electrical message to other neurons that is based on movement of ions in and out of cell
Down
  1. 1. Nerve cell, basic building block of nervous system
  2. 2. Chemical messengers secreted into blood which carries them to organs and tissues
  3. 3. Chemical messengers inside of body that carry messages between neurons
  4. 5. Regulates key involuntary functions of body, has sympathetic and parasympathetic divisions
  5. 7. Increase action of neurotransmitter
  6. 9. Neurotransmitter is taken back into cell that released it to be recycled
  7. 10. Controls body's skeletal muscles that perform voluntary and reflex movements
  8. 11. Passes messages away from cell body to other neurons
  9. 13. After cell is stimulated, negative ions rush out of cell as positive ions rush in
  10. 14. Carry outgoing information from brain and spinal cord to muscles and glands
  11. 19. Chemically controls various functions of cells, tissues, and organs