Ключевые слова: animal, behavior, biological, biology, chemical, childbirth, colorful, design, diagram, drawing, education, educational, flat, food, formula, health, healthy, hormone, human, humans, hypothalamus, illustration, isolated, labeled, labour, man, medical, medicine, neuropeptide, organic, oxytocin, people, peptide hormone, poster, posterior pituitary, products, reproduction, retinol, schema, schematic, scheme, science, sexual activity, social bonding, structure, symbol, vitamin, white, white background,