Physiology Extra Cred

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Across
  1. 2. Potential The electrical charge difference across a neuron’s membrane when the neuron is not firing.
  2. 5. The long projection of a neuron that carries electrical impulses away from the cell body.
  3. 7. The phase when potassium ions leave the neuron and the membrane returns toward its resting state.
  4. 9. Photoreceptor cells responsible for vision in dim light.
  5. 12. Sensory receptors that detect pressure, vibration, and touch.
  6. 14. The autonomic system responsible for the “fight or flight” response.
  7. 16. Photoreceptor cells responsible for color vision and visual acuity.
  8. 17. A fatty insulating sheath around axons that speeds up nerve impulse conduction.
  9. 18. The division of the PNS that regulates involuntary functions like heart rate and digestion.
  10. 19. The phase of the action potential when sodium ions enter the neuron and the membrane becomes more positive.
  11. 21. Specialized sensory cells in the eye that detect light.
  12. 23. The specialized cell that transmits electrical and chemical signals in the nervous system.
Down
  1. 1. Special sensory cells in the nose responsible for detecting smells.
  2. 3. Sensory receptors that detect changes in temperature.
  3. 4. Branch-like extensions of a neuron that receive signals from other neurons.
  4. 6. Potential A small, local change in membrane voltage that varies in size depending on stimulus strength. Synapse The junction between two neurons where communication occurs via neurotransmitters.
  5. 8. A chemical messenger released from a neuron that transmits signals across a synapse.
  6. 10. The minimum membrane potential required to trigger an action potential.
  7. 11. The division of the PNS that controls voluntary skeletal muscle movement.
  8. 13. All nerves outside the brain and spinal cord that connect the CNS to the body.
  9. 15. Division The autonomic system responsible for “rest and digest” body functions.
  10. 20. Potential A rapid electrical signal that travels down a neuron’s axon when it is stimulated past threshold.
  11. 22. The part of the nervous system consisting of the brain and spinal cord.