Biology

12345678
Across
  1. 4. System that produces, maintains, and distributes lymphocytes
  2. 6. general defense that causes pain, redness, and swelling
  3. 7. The thymus is the site where certain _____ blood cells acquire the means to chemically recognize foreign invaders
  4. 8. Disposal site for old red blood cells and foreign debris
Down
  1. 1. ______ B cells are responsible for long term immunity
  2. 2. provides a physical barrier to the entrance of microbes
  3. 3. The lymphatic system absorbs and returns excess interstitial fluid to the
  4. 5. molecule on the surface of a pathogen that the immune system recognizes as a "foe"