Hank tells us in regards to the crew of lethal ninja assassins that’s tasked with defending our our bodies from all of the dangerous guys that wish to …
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Your Immune System: Natural Born Killer – Crash Course Biology #32
acquired allergic allergy Anatomy animal antigen bacteria BIOLOGY body Crash Course crashcourse digestive tract germ health histamine human humoral response Immune system IMMUNITY infection inflammatory response innate lymphocytes Macrophage mast cells microscopic mucous membrane mucus natural killer cell organism Pathogen phagocyte PHYSIOLOGY pus skin t cell vertebrate Virus white blood cells