Definition of Terms

• Immunity or Resistance: the ability to WARD OFF damage through our DEFENSES.
• Susceptibility: Vulnerability or lack of resistance.
• Lymphatic or lymphoid system: consists of a fluid called LYMPH, vessels called LYMPHATIC VESSELS that transport the lymph, a number of structures and organs containing LYMPHATIC TISSUE and RED BONE MARROW.
• Lymphatic Tissue: a specialized form of RETICULAR CONNECTIVE TISSUE that contains large number or LYMPHOCYTES.