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your body defenses

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by

Haley Ford

on 24 January 2013

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Transcript of your body defenses

Your Body Defenses By: Jaylan Mcdonald
Haley Ford what is a fever ? A fever is a disease that affects your body defenses. You get a fever when macrophages activate the helper t-cells, they send a chemical signal that tells your brain to turn up the thermostat. What are the cells of the immune system? What are body defenses? fevers Body defenses is when your body protects itself from germs and foriegn bacteria.



What happens if the first line of defense fail? Your first line of defense is your enzymes. What are the first lines of defense? Your enzymes destroy any type of bacteria that try to enter the body. A type of enzyme is mucus. Whenever a pathogen, bacteria tries to enter your body through the nose or mouth, the mucus will wash it down the back of the throat and into the stomach.
The bacteria will be destroyed and digested there. Another type of enzyme is lysozyme. This enzyme is found in sweat, tears, and saliva. It kills bacteria and breaks down its cell wall Sometimes your skin can be cut or punctured. When this happens the body acts quickly to make sure that there are no pathogens entering the wound.

As the blood flow to the injured area increases, cell parts in the blood called platelets help seal the open wound. The immune system has 3 kinds of cells. t-cells : coordinate the immune system and attack many infected cells.
b-cells : immune system cells that make antibodies .
macrophages : engulf and digest many microorganisms or viruses that enter your body . memory cells your immune system can respond to a sceond encounter faster than it can respond the first time . b cells must have had previous contact with a pathogen before they can make the correct antibodies. Another type cell of memory cells is memory "B" cells. Memory B cells are cells in your immune system Allergies Allergies is another disease to the immune system. An allergy is a reaction to a harmless or common substance by the body's immune system. Allergies are caused by many things such as living things, foods, and medicines. Autoimmune Disease An Autoimmune disease is another disease that affects the immune sytem and your body's defenses. An autoimmune disease happens when the cells in the immune system mistake the cells in the body for pathogens. type 1 diabetes and lupus is a type of autoimmune disease. What are the type of diseases that affect your body defenses? How does you body defenses work with the other body systems?

A lot of diseases mostly go to your immune system. So the body's defenses work by using the 3 cells: T- cells, B- cells, and macrphages. By using these cells, it helps make sure that a virus or disease doesn't get to any other part of the body What are the main organs?
The main organs are the immune system and
your skin. How does the immune system assist the body in maintaining homeostasis? The immune system helps the body to maintain homeostasis by destroying the germs and bacteria that is trying to get into the body. This way you won't have fevers because your immune system has killed the bacteria that can get you sick. References www.google.com
www.google.com/images
www.factmonster.com
http//bcscience8.wikispaces.com
The 7th grade holt life science book
Full transcript