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.
It means the heart beat originated from a muscle, (however, it is regulated by the nerves). The heart beat originates from the sinoatrial node (SA Node)-pace maker, which lies in the wall of the right atrium near the opening of the superior vena cava. The SA node is a mass of neuromuscular tissue. Sometimes, the SA-Node may become damaged or defective. So the heart does not function properly.