The heart muscle has a special property – automaticity. If the heart is removed from the chest, it continues to contract for a while, having no connection with the body. The impulses that make the heart beat rhythmically occur in small groups of muscle cells called knots of automation. The main node of automation is located in the muscle of the right atrium, it is he who sets the rhythm of the heartbeat.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.