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.
Serious Bodily Injury. serious bodily injury n. : bodily injury which involves substantial risk of death, protracted and obvious disfigurement, or protracted loss or impairment of the function of a bodily member or organ or mental faculty compare bodily injury.