refractory period.
The normal heartbeat rpm for someone who is aged 18 is between 60 and 100.
Normal.
This usually causes the irregular heartbeat to be reset into a normal heartbeat.
The heartbeat you feel in your lower stomach is the abdominal aorta beating and it is perfectly normal.
yes
heart rate of 76 indicates what??
YOu really need to talk to your doctor or nurse about this as you have not said why you cannot hear a heartbeat.
Each heartbeat begins with an action potential generated at the sinoatrial node or simple call the SAnode.
yes
Yes it is your own.
Usual cause of irregular heartbeat in toddles is sinus arrhythmia in which the heart rate varies during the phases if respiration. This is normal. However many congenital heart diseases can cause arrhythmia and those children need proper evaluation.
The amount of air inspired and expired during a normal quiet breath is called tidal volume.