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 injury means any of the following: 1  Any physical harm that carries a substantial risk of death. 2  Any physical harm that involves a permanent incapacity, either partial or total; or a temporary substantial incapacity. 3  Any physical harm that involves a permanent disfigurement, or a temporary serious disfigurment.