Ключевые слова: acid, anatomy, background, beat, biology, bladder, blue, bone, brain, breathing, cancer, colon, diagram, disease, graphic, guy, health, heart, heartburn, highlighted, ill, illustration, inflamed, inflammation, kidney, male, man, medical, muscle, pain, painful, pulmonary, red, science, skeletal, spine, stress, suffer, symptom, transparent, xray,