Rabu, 20 Maret 2013

Specific Defence mechanism or the immune system

2. Specific Defence mechanism or the immune system: 

Immune system was discovered by Edward Genner and he also discovered the small pox vaccination. The immune system has two components, such as:

a) Humoral immune system: 
    This system consists of varieties of proteins called antibodies present in the blood plasma. When any foreign germ invades the body, the antibodies inactivate the same and then these foreign germs are invaded by the phagocytic action of the WBCs. The different kinds of antibodies form the third line of defence.

b) Cell-mediated immune system:  
    This system protects the body from different pathogens including fungi and protists that enter into the body from time to time. The system also reacts against tissue transplants and even against some cells of the body, which become cancerous. One of the important characteristics features of this immune system in our body is that it is able to differentiate the body’s own cell and the cells entering into the body from out side. Antibodies are produced by the immune system in response to the entry of foreign antigens into the body.

1.bacteria (bak-TEER-e-uh) are microscopic organisms, some types of which can cause disease.
2. fungi (FUNG-eye) are microorganisms that can grow in or on the body, causing infections of internal organs or of the skin, hair, and nails.
3.parasites (PAIR-uh-sites) are organisms such as protozoa (one-celled animals), worms, or insects that must live on or inside a human or other organism to survive. An animal or plant harboring a parasite is called its host. Parasites live at the expense of the host and may cause illness.

viruses (VY-ruh-sez) are tiny infectious agents that can cause infectious diseases. A virus can only reproduce within the cells it infects


Sumber : Bpk. Dr. Iskandar Zulkarnain

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