Unit 3 Vocabulary Crossword Puzzle

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