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That system is called as integumentary system. in simple word it is called as skin.
Mechanical injury, such as knives, guns or other iron cutting, hitting, friction, and injury. Chemical injury (such as: alkali, acid, mercury, lead) Biological injury (mainly micro-organisms, including viruses, bacteria, fungi, parasites, etc.) To prevent loss of nutrients in vivo. Limit the penetration of external substances, sex hormones, corticosteroids, glucose, potassium chloride and so on.
your skull
Protects your brain from injury
It depends on the type of aggression. Potential attacks primarily do not aim at tissues; they are secondarily affected. Two examples of how internal body tissues are protected are: The skin protects tissues from invasion of harmful external substances. The rib cage protects the lungs and heart from injury.
nobody wants to but you can do it!
your sckull of course what else
The Skull Dumb-Dumb
bodily injury liability coverage
Koalas are not poisonous. However, a scratch or bite from a koala can still contain harmful bacteria as they can't wash their hands like humans. While not as harmful as a snake bite, any injury inflicted by a koala (or any animal) should be treated immediately, just to be safe.
nanofrokles and megafrokles
It protects the organism from microorganisms, injury, fluid loss, and it's organs.