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The Immune System
Start of Term Paper
is a group of cells, molecules, and tissues that help
defend the body against diseases and other harmful invaders.
provides protection against a variety of potentially damaging substances that
can invade the body. These substances include d .... Middle of Term Paper
... The immune system
reacts to foreign substances through a series of steps know as the immune
response. Any agent perceived as foreign by a body's immune system is called an
antigen. Several types of cells may be involved in the immune response to
antigens.
When an antigen enters the body, it may be partly neutralized by
components of the innate immune system. It may be attacked by phagocytes or by
performed antibodies that act together with the complement system. The human
immune system contains approximately 1 trillion T cells and 1 trillion B cells,
located in the lymphoid organs and in the blood, plus approximately 10 billion
antigen ... |
| Number of Words: 732 |
Approximate Pages: 3 |
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