Across
- 4. / Any organism that can cause disease.
- 6. / Primary function of melanin.
- 7. / A rapid rise and subsequent fall in voltage or membrane potential.
- 10. / Protein that forms thin filaments in muscle fibers.
- 11. / Substance that induces an immune response.
- 12. / Pigment providing skin color and UV protection.
- 13. / Junction between two nerve cells.
- 14. / Cells responsible for bone formation.
- 16. / Insulating layer around nerves.
- 17. / Cells responsible for producing antibodies.
- 23. / Biological preparation providing acquired immunity.
- 24. / Dense outer layer of bone providing strength.
- 25. / Chemical messengers in the nervous system.
- 26. / This soft tissue produces blood cells.
- 27. / They help in cooling the body.
- 28. / Mineral vital for bone strength.
- 30. / Cells that play a central role in cell-mediated immunity.
Down
- 1. / Basic unit of the nervous system.
- 2. / Shortening of muscle fibers.
- 3. / Ability of muscles to work for extended time.
- 5. / Mature bone cells.
- 7. / Energy molecule required for muscle movement.
- 8. / Long part of a neuron transmitting impulses.
- 9. / Glands producing oil in the skin.
- 15. / Type of white blood cell.
- 18. / Protein used by the immune system to neutralize pathogens.
- 19. / Structure in the dermis where hair originates.
- 20. / First line of defense in the immune response.
- 21. / The unit of muscle contraction.
- 22. / Protein that strengthens skin, hair, and nails.
- 29. / Central nervous system, comprising the brain and spinal cord.