Ключевые слова: anatomy, artery, biology, blood, blood vessel, bloodstream, body, cell, cholesterol, circulatory system, clinic, closeup, erythrocyte, erythrocytes, flow, health, heart, hematology, hemoglobin, human, immune, immunology, infection, inside, laboratory, leukocyte, lipids, macro, magnification, medical, medicine, microbiology, microscope, microscopic, microscopy, molecule, morphology, organic, organism, oxygen, particles, red, science, scientific, sick, sickness, structure, system, vein,