bone marrow (people who are exposed to the x ray's radiation for a long time have destroyed bone marrow and die from infections)
A barrier... in humans that would be your skin.
One of the most important guards against infections and germs is proper hand washing with soap and water.
Ron Jeremy
The first line of defense is the skin. It tries to keep germs out of the body. If germs get inside the body, then Leucocytes (White blood cells) and antibodies attack the invaders and try to destroy them.
To fight against germs and bacteria that can cause disease and infections. The cells work as part of the immune system.
The skin is the body's best natural barrier against germs. It acts as a physical barrier to prevent germs from entering the body and also has its own defense mechanisms, such as producing antimicrobial substances. Proper hygiene practices also help to maintain the skin's barrier function.
Healthy skin acts as a strong barrier against germs and pathogens, preventing them from entering the body. However, if the skin is broken or compromised, such as through cuts, abrasions, or insect bites, germs can penetrate and cause infections. In general, intact skin is very effective at keeping germs out.
To fight against germs and bacteria that can cause disease and infections. The cells work as part of the immune system.
Other "good" germs help fight infections.Antibiotics are used to get rid of "bad" germs.
The primary boundary is your skin, but almost every organ has some defense against germ infection.
Your nose is much better at protecting your body from germs due to hair follicles and mucus. Your mouth does not contain these defense mechanisms and is therefore more susceptible to infections.
The bacteria and all of the germs come together and cause the infections in your intestine