The functioning of heart involves a large number of mechanisms which is achieved by a lot of other various processes, and to perform all these processes, the structure of heart is being developed over time. Any failure of at least one of which will lead to a complete stoppage of the entire machine.
Without ATP (nucleotide, which plays a very important role in the metabolism and energy in the body and is known as a universal source of energy for absolutely all biochemical processes). If the cell ceases to produce ATP, then this is equivalent to stopping the generators at the power plant.
Lysosomes purify the cell from unnecessary metabolic products, and also regulate a number of important intracellular processes aimed at restoring cell particles destroyed during its functioning.
There can be possibility under some pathology when the atria and ventricles of the heart contract simultaneously, and this condition is known as occlusion of the atria. The fact is that the muscle mass of the ventricles is much larger than the muscle mass of the atria, in other words – the musculature of the ventricles is stronger than the musculature of the atria. If all parts of the heart become agitated and contract simultaneously, then the atria will not be able to push blood into the ventricles, the hemodynamic wave will go in the opposite direction – to the pulmonary and hollow veins, this will severely disturb hemodynamics and can lead to serious circulatory disorders, fainting, more or less prolonged loss of consciousness, etc. But in the norm this does not arise, since in the activity of the heart departments there is a very strict sequence.
Cells of the heart conductor system contain much less myofibrils. They are consist of more glycogen (energy reserve), and they are more resistant to some adverse effects; for example, to a lack of oxygen than the rest of the heart muscle tissue. But especially large differences in them are revealed in the study of their ability to generate electrical potentials.
When the electric charge of the cell membrane during a slow diastolic depolarization reaches a certain level, this fiber itself (without any external stimulus) is excited and an action potential arises. Hence, a smooth feature of the conductive tissue of the heart is its ability to spontaneous (that is, occurring without any external influences) generation of the action potential.