Across
- 2. Chemical messenger between neurons
- 5. Neurotransmitter used in muscles
- 6. Cell that sends electrical signals
- 7. Spot with the sharpest vision
- 9. Fast automatic response pathway
- 12. Long fiber that carries signals away
- 14. Minimum charge needed to fire
- 18. Support cell that protects neurons
- 19. Light‑sensitive layer of the eye
- 24. Fight‑or‑flight division
- 27. Second neuron reaching the organ
- 29. Controls involuntary organs
- 33. First neuron in autonomic pathway
- 34. Rest‑and‑digest division
- 35. Sense of taste
- 36. Signal that decreases firing chance
- 40. Detects touch or pressure
- 42. Controls breathing and heart rate
- 44. Signal that increases firing chance
- 45. Branch that receives incoming signals
- 46. Sense of body position
- 47. Coordinates balance and movement
- 48. Neuron cell bodies
Down
- 1. Detect head rotation
- 3. Fast all‑or‑none electrical signal
- 4. Detects light
- 8. Helps maintain balance
- 10. Regulates homeostasis and hormones
- 11. Myelinated axons
- 12. Region where action potentials begin
- 13. Sensory cells for hearing and balance
- 15. Fatty insulation that speeds conduction
- 16. Sense of smell
- 17. Small local electrical change
- 20. Detects pain
- 21. Space where neurons communicate
- 22. When the membrane returns toward resting
- 23. Normal electrical charge of a neuron
- 25. When the membrane becomes more negative
- 26. Relay center for sensory input
- 28. Spiral structure for hearing
- 30. Neurotransmitter used in sympathetic pathways
- 31. Carries visual signals to the brain
- 32. Detects temperature
- 37. Brain region for thinking
- 38. When the membrane becomes less negative
- 39. Controls voluntary skeletal muscles
- 41. Gap in myelin where signals jump
- 43. Connects brain and body