A hollow muscular organ consisting of two atria and two ventricles. The wall of the heart is represented by the epicardium – the connective tissue membrane, the myocardium – the muscular membrane of the striated cardiac muscle tissue, and the endocardium, the inner membrane. The pericardium forms a pericardial sac, the inner layer of which secretes serous fluid, which reduces the frictional force during muscle contractions. The aorta departs from the left ventricle, the pulmonary artery departs from the right ventricle.
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.