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.
The SA node (sometimes called the pacemaker) generates electrical impulses similar to nerve impulses at the start of every cardiac cycle, setting the rate and timing at which the rest of the heart contracts [1]. The impulses then spread rapidly through the top of the heart, causing uniform contraction in both atria.