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.
The Brain Injury Foundation. The Brain Injury Foundation is dedicated to the prevention of brain damage caused by lack of oxygen and bloodflow to the brain. This injury is known as Hypoxic (low oxygen) Ischemic (low bloodflow) Injury, or HII. Without oxygen reaching the brain, irreversible brain damage starts to occur within 5 minutes. The Mission of our Foundation is to save lives and prevent permanent brain damage of Sudden Cardiac Arrest victims.