How do immune system cells differentiate between normal, healthy body cells and non-self cells within the body?
A. All normal, healthy body cells are considered part of the immune system.
B. Immune system cells recognize normal healthy body cells by the presence of the nucleus, a structure that is lacking in non-self cells.
C. Non-self cells express surface proteins that are different from normal, healthy body cells and recognized as "foreign" by immune system cells.
D. Non-self cells are easily identified by the immune system cells, because non-self cells are much larger than normal, healthy body cells.
C
Normal, healthy body cells all express surface proteins that are unique to the person, coded by the major histocompatibility genes. Non-self cells express different cell surface proteins. Immune system cells can distinguish between their own surface proteins and all others.
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