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.
injury. harm or hurt; usually applied to damage inflicted on the body by an external force. Called also trauma and wound. brain injury impairment of structure or function of the brain, usually as a result of a trauma. deceleration injury a mechanism of motion injury in which the body is forcibly stopped but the contents of the body cavities remain in motion due to inertia; the brain is particularly vulnerable to such trauma.