The central nervous system does not change the sequence of contractions of the atria and ventricles, but it can change their rhythm. When a person is resting, the heart works more slowly. When he is busy with hard physical work, the heart works harder and more often. This is because two nerves approach the heart: sympathetic – accelerating and wandering, slowing down cardiac activity.
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.