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    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.
    Healthy cardiovascular system — Stock Photo
    Healthy cardiovascular system
    Erythrocytes or red blood cells — Stock Photo
    Erythrocytes or red blood cells
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Blood supply network of human head — Stock Photo
    Blood supply network of human head
    Shoulder blood supply — Stock Photo
    Shoulder blood supply
    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.
    Entangled red blood vessels, digital illustration. — Stock Photo
    Entangled red blood vessels, digital illustration.
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Cardiovascular system with emphasis on heart — Stock Photo
    Cardiovascular system with emphasis on heart
    Blood vessels of the arms — Stock Photo
    Blood vessels of the arms
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red).
    Virus particles in blood stream, digital illustration. — Stock Photo
    Virus particles in blood stream, digital illustration.
    Medical illustration of artificial heart valve. — Stock Photo
    Medical illustration of artificial heart valve.
    3d illustration of blood plasma and components of blood flowing from artery. — Stock Photo
    3d illustration of blood plasma and components of blood flowing from artery.
    Human vascular system — Stock Photo
    Human vascular system
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Malaria infection infecting red blood cells, digital illustration. — Stock Photo
    Malaria infection infecting red blood cells, digital illustration.
    Adult male structural anatomy — Stock Photo
    Adult male structural anatomy
    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.
    Human Platelets, computer illustration — Stock Photo
    Human Platelets, computer illustration
    Normal human arteries, — Stock Photo
    Normal human arteries,
    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.
    Cardiovascular system of an adult — Stock Photo
    Cardiovascular system of an adult
    Wake behind a boat along the coastline of Sermersooq; Sermersooq, Greenland — Stock Photo
    Wake behind a boat along the coastline of Sermersooq; Sermersooq, Greenland
    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.
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Red blood cells, digital illustration. — Stock Photo
    Red blood cells, digital illustration.
    Bloodstream showing red blood cells — Stock Photo
    Bloodstream showing red blood cells
    Coronary angioplasty stent insertion — Stock Photo
    Coronary angioplasty stent insertion
    Red blood cells — Stock Photo
    Red blood cells
    3d illustration of blood plasma and components of blood flowing from artery. — Stock Photo
    3d illustration of blood plasma and components of blood flowing from artery.
    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.
    Narrowed artery causing atherosclerosis — Stock Photo
    Narrowed artery causing atherosclerosis
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Newborn digestive and cardio-vascular systems — Stock Photo
    Newborn digestive and cardio-vascular systems
    Illustration showing different types of blood cells, erythrocytes, neutrophil, monocyte, basophil, eosinophil, lymphocyte, and platelets. — Stock Photo
    Illustration showing different types of blood cells, erythrocytes, neutrophil, monocyte, basophil, eosinophil, lymphocyte, and platelets.
    Blood vessels of the neck — Stock Photo
    Blood vessels of the neck
    Human heart anatomy — Stock Photo
    Human heart anatomy
    Medical illustration of artificial heart valve. — Stock Photo
    Medical illustration of artificial heart valve.
    Human heart anatomy — Stock Photo
    Human heart anatomy
    Doctors undertaking cardiopulmonary resuscitation training on dummies. — Stock Photo
    Doctors undertaking cardiopulmonary resuscitation training on dummies.
    Blood clot, computer illustration — Stock Photo
    Blood clot, computer illustration
    First-aiders practicing cardiopulmonary resuscitation on training dummy. — Stock Photo
    First-aiders practicing cardiopulmonary resuscitation on training dummy.
    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.
    Ebola virus particles in blood, digital illustration. — Stock Photo
    Ebola virus particles in blood, digital illustration.
    Colored scanning electron micrograph of human red blood cells erythrocytes, white blood cells leukocytes and platelet thrombocyte. — Stock Photo
    Colored scanning electron micrograph of human red blood cells erythrocytes, white blood cells leukocytes and platelet thrombocyte.
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Doctor practicing chest compression on cardiopulmonary resuscitation training dummy. — Stock Photo
    Doctor practicing chest compression on cardiopulmonary resuscitation training dummy.
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Female cardiovascular system on white background. — Stock Photo
    Female cardiovascular system on white background.
    Human brain with network of blood vessels — Stock Photo
    Human brain with network of blood vessels
    Healthy heart anatomy — Stock Photo
    Healthy heart anatomy
    3d illustration of activated platelets and thrombocytes while healing and closure of wound. — Stock Photo
    3d illustration of activated platelets and thrombocytes while healing and closure of wound.
    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.
    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).
    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.
    Red blood cells, digital illustration. — Stock Photo
    Red blood cells, digital illustration.