Dreams that involve hair loss or the loss of teeth, false teeth, etc, are normally a sign that you're worried about either aging, or - more frequently - the passage of time, that life is passing you by in some way.<br /> <br /> I don't think you can analyse dreams precisely.
SA node. the main pacemaker that initiates each heart beat located at the junction of the superior vena cava and the right atrium the SA node generates electrical impulses at 60 to 100 times per minute and is controlled by the sympathetic and parasympathetic nervous system.
What a pacemaker does is keep the heart beating at the proper rate and from beating too slow. It also will only activate if it is needed, it is not shocking people all the time. An implanted defibrillator is a bigger device. It is there to prevent death from a cardiac arrest.