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The Immune System
Pyrogens: Foreign substances and or microorganisms that causes hypothalamic thermoregulatory
center to increase and causes fever (pyrexia), are called pyrogens.
Right Lymphatic Duct: Lymphatic duct that serves all of the right side of the upper body and
thorasic area(head,neck)
Spleen: Ductless, vertebrate gland that is closely associated with the circulatory system, where it
functions in the destruction of old red blood cells in holding a reservoir of blood
T Cell: cells that carry out cell-mediated immunity
Thoracic Duct: Lymphatic duct that serves the abdomen, lower extremities and the left side of the
upper body(head,neck, and arm)
Thymus Gland: Gland that contains lymphocytes; produces thymosin that is thought to aid in the
maturation of T lymphocytes
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