Immune System
Polymorphonuclear leukocytes (or PMNs)

are a type of phagocyte that can engulf and kill bacteria
All of these
are derived from bone marrow stem cells
can be attracted to the site of an infection following activation of complement

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Immune System
The role of the M cell is to

they use their cilia to propel mucus out of the small intestine
induce apoptosis in virus-infected small intestinal epithelia cells
pass bacteria or virus to underlying macrophages for processing and presentation of antigen
trap virus in mucus and prevent entry

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Immune System
Which of the following is correct for isoantigens?

They are antigens found in all members of different species
They are antigens found in some members of different species
They are antigens found in some members of a species
They are antigens found in all members of a species

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