Alec Tripi



The Immune System

Your Body's Defense system

Do you have what it takes to kill every killing machine known to man that is so small that you can't see it? Actually, the answer is yes, it does, thanks to your Immune System, your body's defense system.

What is it?

The immune system makes all the defense mechanisms against pathogens in your body (pathogens are evil cells like bacteria and viruses).

DID YOU KNOW: Disease symptoms are sometimes the result of your immune system fighting the disease

The immune system protects you in 3 different ways:

  1. It creates a barrier that prevents bacteria and viruses from entering your body. The main defense is the skin.
  2. If a bacteria or virus does get into the body, the immune system tries to detect and eliminate it before it can make itself at home and reproduce.
  3. If the virus or bacteria is able to reproduce and start causing problems, your immune system is in charge of attacking and then eliminating it.
bacteria back down

DID YOU KNOW:  That you have cells that store memory of pathogens that your immune system has defeated so that you know how to fight it when, or if it comes back.


The immune system is made up of organs that control the production and maturation of certain defense cells, the lymphocytes. Bone marrow and the thymus, a gland situated above the heart and behind the breast bone (it trains T cells), are so-called primary lymphoid organs. The bone marrow produces defense cells. Also theres the spleen. (the guy down there)

the spleen at work

This your spleen. (^) It might not look like the above picture, but nonetheless, it is the most vital organ to your immune system. It is full of red blood cells and it circulates lymph nodes, bean shaped structures that produce white blood cells, that are significant factors in fighting harmful pathogens like bacteria.

fighting diseases

Lines Of Defense

  1. The first line of defense is your skin, it protects you from over a thousand pathogens every day.
  2. Then, if pathogens get manage to get through your skin, or if you ingest them, then T-cells send alerts to the B-cells to attack the germ.
  3. The B-cells split into memory cells that store info about how to kill the cell, and fighter cells that attack.
  4. Then the T-cells eat the dead antigens and your body is saved!

Die Diseases!

(check out the B cells muscles! :p)

The immune system protects all of the other  bodily systems from infection and germs so it's probably the most important system of all!

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