Ключевые слова: anatomical, anatomy, biology, body, brain, calming, cells, cognitive, comparison, connections, diagram, education, educational, emotional, function, functioning, health, healthcare, human, illustration, imagery, learning, medical, nerve, nervous, neural, neuroscience, neurotransmitters, parasympathetic, pathways, physiology, regulation, relaxation, representation, response, science, stress, sympathetic, system, systems, tones, tool, visual,