Bone marrow, thymus, spleen, liver, and lymph nodes {immune system, organ}| protect body from invading organisms.
self
Immune system can recognize organism cells, because all body cell-membrane outsides have same cell-recognition glycoproteins.
antibodies
Immune-system cells can recognize antibodies, because antibodies complex with cell-recognition glycoproteins.
humoral immunity
Immune system can kill bacteria and viruses in cell fluids.
cellular immunity
Immune system can absorb body cells that have been damaged by viruses or bacteria and regulate immune system.
evolution
Humoral immunity and cellular immunity both come from same precursor cells during development.
acidity
Stomach acidity and urine acidity kill and suppress bacteria.
Biological Sciences>Zoology>Organ>Immune System
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Date Modified: 2022.0224