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The Immune System

Part 1 of Paper
....armful 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 these invaders is called immunity. A key feature of the immune system....

Part 2 of Paper
.... 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-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....

Number of words: 732 - Approximate pages: 3

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