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Beginning of Paper
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The Immune System
The immune system is a group of cells, molecules, and tissues that help
defend the body against diseases and other harmful invaders. The immune system
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 the ....
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Middle of Paper
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.... lymphoid organs and in the blood, plus approximately 10 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 blood and lymphoid tissues.
Lymphocytes are special types of white blood cells. Like o ....
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ADDITIONAL FEATURED ESSAYS
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