Unit 3 Vocabulary Crossword Puzzle

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Across
  1. 2. the ability to resist or recover from an infectious disease
  2. 5. the organ that is the main control center of the nervous system
  3. 6. the many tiny, thin-walled, capillary-rich sacs in the lungs where the exchange of oxygen and carbon dioxide takes place
  4. 7. a group of cells that make chemicals for use everywhere else in the body
  5. 8. a tough connective tissue that attracts a muscle to a bone or to another body part
  6. 9. the maintenance of a constant internal state in a changing environment
  7. 12. a protein made by B cells that binds a specific antigen
  8. 13. a type of protein that speeds up metabolic reactions in plants and animals without being permanently changed or destroyed
  9. 14. small, bean shaped masses of the tissue that remove pathogens and dead cells from the lymph
  10. 19. a nerve cell that is specialized to receive and conduct electrical impulses
  11. 20. a substance that is made in one cell or tissue and causes a change in another cell or tissue in another part of the body
  12. 21. an elongated extension of a neuron that carries impulses away from the cell body
Down
  1. 1. a type of tissue that holds bones together in a joint
  2. 3. the two main branches of the trachea that lead directly to the lungs
  3. 4. tiny infectious particles that cause disease
  4. 10. a column of nervous tissue running from the base of the brain through the vertebral column
  5. 11. branchlike extensions of a neuron that receives impulses from neighbor neurons
  6. 15. a microorganism, a virus, or a protein that causes disease
  7. 16. the unit in the kidney that filters blood
  8. 17. the clear, watery fluid that leaks from blood vessels and contains white blood cells
  9. 18. a place where two or more bones meet