Ключевые слова: anatomy, arteries, atria, atrium, background, biology, blood, body, cardiac, cardiology, cell, classroom, connective, cuts, disease, education, epithelium, equipment, exercise, experiment, fiber chat conversation end type a message, health, healthy, heart, histology, human, internal, isolated, laboratory, medical, medicine, muscle, muscles, muscular, nucleus, organ, oxygen, parts, patient, physical, physiology, pig, pulmonary, red, research, science, scientific, smooth, structure, structures, study, system, test, tissue, valves, veins, white,