Across
- 2. A medical condition with specific symptoms
- 8. A medical condition that is caused by a pathogen
- 11. A column in the periodic table
- 13. A row in the periodic table
- 14. A cell that detects inputs of a specific type
- 16. Barriers that prevent pathogens from entering the body
- 18. An attraction between atoms that share electrons
- 19. The brain and spinal cord
- 20. A protein that can identify and fight a specific pathogen
- 21. chain A polymer molecule that has side chains
- 22. A cell that transmits electrical signals
Down
- 1. something which can be broken down by a living thing
- 3. A piece of plastic that is less than 5 millimeters in size
- 4. The outermost occupied shell of an atom
- 5. A microscopic organism or agent that causes disease
- 6. A synthetic polymer
- 7. The number of protons in each atom of an element
- 9. The gap between neurons where signals are sent from one to another
- 10. the body's ability to maintain stable environment
- 12. A treatment that helps build immunity to an infectious disease
- 15. The arrangement of electrons in shells around an atom's nucleus
- 17. An electrostatic attraction between ions with opposite charges