Important Words for the exam

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