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The Immune System
Beginning of essay
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, para ....
Middle of essay
.... 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 other white
blood cells, lymphocytes originate in the bone marrow, the blood-forming tissue
in the center of many bones. Some lymphocytes mature in the bone marrow and
become B lymphocytes, also know as B cells. The B stands for bone marrow
derived. Some of th.... |
| Number of words: 732 |
Approximate pages: 3 |
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