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    Astrocyte brain glial cell connecting neuronal cells to blood vessel, digital illustration. — Stock Photo
    Astrocyte brain glial cell connecting neuronal cells to blood vessel, digital illustration.
    Red blood cells — Stock Photo
    Red blood cells
    Red blood cells — Stock Photo
    Red blood cells
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Normal blood vessels, X-ray — Stock Photo
    Normal blood vessels, X-ray
    Brain's blood supply — Stock Photo
    Brain's blood supply
    Human heart circulatory and electrical system, 3d illustration. Cross section of the heart showing the ventricles and valves, and the electrical (conduction) system (yellow lines) and circulatory system (red and blue lines). — Stock Photo
    Human heart circulatory and electrical system, 3d illustration. Cross section of the heart showing the ventricles and valves, and the electrical (conduction) system (yellow lines) and circulatory system (red and blue lines).
    Human anatomy emphasizing upper-body — Stock Photo
    Human anatomy emphasizing upper-body
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Erythrocytes or red blood cells — Stock Photo
    Erythrocytes or red blood cells
    Red blood cells and white blood cells — Stock Photo
    Red blood cells and white blood cells
    Red blood cells, digital illustration. — Stock Photo
    Red blood cells, digital illustration.
    Cholesterol plaque leading to atherosclerosis — Stock Photo
    Cholesterol plaque leading to atherosclerosis
    Upper-body anatomy of adult male — Stock Photo
    Upper-body anatomy of adult male
    Human vein showing tissue stratification — Stock Photo
    Human vein showing tissue stratification
    Vascular system and skeleton of an adult — Stock Photo
    Vascular system and skeleton of an adult
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Cardiovascular system with emphasis on heart — Stock Photo
    Cardiovascular system with emphasis on heart
    Bloodstream showing red blood cells — Stock Photo
    Bloodstream showing red blood cells
    Cardiovascular system of an adult — Stock Photo
    Cardiovascular system of an adult
    Arteries and veins of the hand — Stock Photo
    Arteries and veins of the hand
    Normal red blood cells — Stock Photo
    Normal red blood cells
    Nanomachines working on red blood cells, digital illustration. — Stock Photo
    Nanomachines working on red blood cells, digital illustration.
    Bloodstream showing red blood cells — Stock Photo
    Bloodstream showing red blood cells
    Brain's blood supply — Stock Photo
    Brain's blood supply
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Digital illustration showing abundant lymphoblast cells in human blood in acute lymphoblastic leukaemia. — Stock Photo
    Digital illustration showing abundant lymphoblast cells in human blood in acute lymphoblastic leukaemia.
    First-aider practicing cardiopulmonary resuscitation on training dummy. — Stock Photo
    First-aider practicing cardiopulmonary resuscitation on training dummy.
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Red blood cells — Stock Photo
    Red blood cells
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Human Platelets, computer illustration — Stock Photo
    Human Platelets, computer illustration
    Wall of a muscular artery — Stock Photo
    Wall of a muscular artery
    Chest, neck and head arteries — Stock Photo
    Chest, neck and head arteries
    Malaria infection infecting red blood cells, digital illustration. — Stock Photo
    Malaria infection infecting red blood cells, digital illustration.
    Colored angiogram of carotid artery in neck of mature patient. — Stock Photo
    Colored angiogram of carotid artery in neck of mature patient.
    Colored illustration showing abundant lymphoblast cells in human bone marrow smear in acute lymphoblastic leukaemia. — Stock Photo
    Colored illustration showing abundant lymphoblast cells in human bone marrow smear in acute lymphoblastic leukaemia.
    Illustration of platelets (thrombocytes) that have been activated (with extensions) and those that are non-activated. Platelets are part of the blood. When a blood vessel is damaged, the platelets become activated and secrete chemicals that cause the — Stock Photo
    Illustration of platelets (thrombocytes) that have been activated (with extensions) and those that are non-activated. Platelets are part of the blood. When a blood vessel is damaged, the platelets become activated and secrete chemicals that cause the
    Coloured scanning electron micrograph of human red blood cells, white blood cells and platelets. — Stock Photo
    Coloured scanning electron micrograph of human red blood cells, white blood cells and platelets.
    Red blood cells and protein particles, digital illustration. — Stock Photo
    Red blood cells and protein particles, digital illustration.
    Digital illustration showing destruction of lymphoblast cells, acute lymphoblastic leukaemia treatment concept. — Stock Photo
    Digital illustration showing destruction of lymphoblast cells, acute lymphoblastic leukaemia treatment concept.
    Blood clot, computer illustration — Stock Photo
    Blood clot, computer illustration
    Healthy red blood cells — Stock Photo
    Healthy red blood cells
    Representation of Circulatory system — Stock Photo
    Representation of Circulatory system
    Pathological anatomy of Stroke — Stock Photo
    Pathological anatomy of Stroke
    Cardiovascular system of an adult — Stock Photo
    Cardiovascular system of an adult
    Skeletal and cardiovascular systems of adult — Stock Photo
    Skeletal and cardiovascular systems of adult
    Normal blood cells in artery — Stock Photo
    Normal blood cells in artery
    Activated T lymphocytes and red blood cells on scanning electron micrograph. — Stock Photo
    Activated T lymphocytes and red blood cells on scanning electron micrograph.
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Ebola virus particles in blood, digital illustration. — Stock Photo
    Ebola virus particles in blood, digital illustration.
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Human brain with network of blood vessels — Stock Photo
    Human brain with network of blood vessels
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Circulatory system and blood supply — Stock Photo
    Circulatory system and blood supply
    Ruptured venule running through fatty tissue — Stock Photo
    Ruptured venule running through fatty tissue
    Human veins anatomy — Stock Photo
    Human veins anatomy
    Virus particles in blood stream, digital illustration. — Stock Photo
    Virus particles in blood stream, digital illustration.
    Skeletal and cardiovascular systems of adult — Stock Photo
    Skeletal and cardiovascular systems of adult
    Blood supply of human arm — Stock Photo
    Blood supply of human arm