Nervous System

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Across
  1. 4. Specialized receptor cell in the retina that detects light.
  2. 5. Division of the peripheral nervous system that controls voluntary skeletal muscle movement.
  3. 7. The division of the nervous system consisting of the brain and spinal cord.
  4. 8. The part of the nervous system that includes all nerves outside the brain and spinal cord.
  5. 11. A chemical messenger released from neurons to transmit signals across a synapse.
  6. 14. The membrane potential level that must be reached for an action potential to occur.
  7. 15. Branch of the autonomic nervous system responsible for the fight-or-flight response.
  8. 17. The process that restores the membrane potential to its resting negative value after depolarization.
  9. 19. The excitable cell that receives, processes, and transmits information through electrical and chemical signals.
  10. 20. Long neuronal projection that carries electrical signals away from the cell body.
  11. 22. A variable change in membrane potential that decreases in strength as it spreads from its origin.
  12. 24. The sense of smell.
  13. 25. Sensory receptor that detects chemicals such as odors or dissolved substances.
  14. 26. Sensory receptor that responds to mechanical pressure or stretch.
  15. 27. The rapid transmission of action potentials that jump from node to node along a myelinated axon.
  16. 28. Light-sensitive layer of the eye containing photoreceptors.
  17. 29. The junction where a neuron communicates with another cell.
  18. 30. A rapid, all-or-none electrical signal that travels along the axon of a neuron.
Down
  1. 1. Specialized cell or structure that detects stimuli and converts them into electrical signals.
  2. 2. Branch of the autonomic nervous system responsible for rest-and-digest functions.
  3. 3. Branch-like extensions of a neuron that receive incoming signals from other neurons.
  4. 6. Sensory receptor that detects changes in temperature.
  5. 9. Receptor that senses body position and movement.
  6. 10. A decrease in membrane potential where the inside of the cell becomes less negative.
  7. 12. Non-neuronal support cells that protect, nourish, and insulate neurons in the nervous system.
  8. 13. Lipid-rich insulating sheath around axons that increases the speed of nerve impulse conduction.
  9. 16. Inner ear structures that detect rotational head movement and help maintain balance.
  10. 18. Division of the peripheral nervous system that regulates involuntary body functions such as heart rate and digestion.
  11. 21. Sensory receptor that responds to potentially damaging stimuli and produces pain.
  12. 23. Spiral-shaped inner ear structure responsible for hearing.