Blood and The Immune System.

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Blood

By

Gary Jones

Components of the blood.

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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 these

invaders is called immunity. A key feature of the immune system is its ability

to destroy foreign invaders while leaving the body's own healthy tissues alone.

Sometimes, however, the immune system attacks and damages these healthy tissues.

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