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The Immune System
Beginning of 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 disease-causing organisms, such
as bacteria, fungi, parasites, and viruses. The body's ability to resist ....
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....billion
antigen-presenting cells located in the lymphoid organs. To maximize the chances
of encountering antigens wherever they may invade the body, lymphocytes
continually circulate between the blood and certain lymphoid tissues. A
lymphocyte spends an average of 30 minutes per day in the blood and recirculates
about 50 times per day between the b.... |
| Word count: 732 |
Page count: 3 |
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