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In the alimentary canal, the ____________ is described as the outermost, protective layer around an organ.

Histamine functions by:

The movement of food through the alimentary canal is referred to as ____________________.

Using immune sera to treat snake bites is an example of:

________________ is defined as the movement of phagocytic cells through capillaries into the site of     inflammation.

Interferons are especially helpful at protecting the body from:

Special chemicals called perforins are released by:

___________ stimulate the proliferation of T cells and B cells that are attached to an antigen.

Sebum and lysozyme are known for their ability to kill:

Inflammation is important because it: