Nervous System

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