Some substances are more toxic than others. The toxicity of a substance is described by the types of effects it causes and its potency. 1  Types of Effects: Different chemicals cause different effects.
I think I remember reading that injured means bruises and lascerations, seriously injured meant hospital but not life threatening, critically injured meant hospital ICU time and fatally injured meant injuries leading to dying sometime later.
In the case of a trauma center, trauma refers to a serious or critical bodily injury. The most common causes of injury that bring patients to a trauma center are falls and motor vehicle crashes. These events cause life-threatening trauma in multiple areas of the body.