Ventricular fibrillation is one type of arrhythmia that can be deadly. It occurs when the heart beats with rapid, erratic electrical impulses. This causes pumping chambers in your heart (the ventricles) to quiver uselessly instead of pumping blood. Without an effective heartbeat, blood pressure plummets, cutting off blood supply to your vital organs.
In the ABO system, (and Rhesus D system) all blood belongs to one of four major groups: A+/â, B+/â, AB+/â, or O+/â. The presence (+) or absence (â) of the RhD (Rhesus D) antigen is indicated by the plus or minus following the ABO type. But there are more than two hundred minor blood groups that can complicate blood transfusions. These are known as rare blood types.
To answer your first question. There are four blood types. A (can be + or - ) B (can be + or - ) AB (can be + or - ) O (can be + or - ) Blood types are inherited from your parents. For example. My mother has A blood type, my father has O blood type. My two sisters have O type blood, so they share my fathers blood type and mine is A, so I get mine from my mother.