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    Colored angiogram of carotid artery in neck of mature patient. — Stock Photo
    Colored angiogram of carotid artery in neck of mature patient.
    Red blood cells — Stock Photo
    Red blood cells
    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.
    Sickle cell anemia — Stock Photo
    Sickle cell anemia
    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.
    Medical illustration of head arteries, veins and lymphatic system — Stock Photo
    Medical illustration of head arteries, veins and lymphatic system
    Anatomy of heart interior with labels — Stock Photo
    Anatomy of heart interior with labels
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Human Platelets, computer illustration — Stock Photo
    Human Platelets, computer illustration
    Colored angiogram of carotid artery in neck of mature patient. — Stock Photo
    Colored angiogram of carotid artery in neck of mature patient.
    Medical illustration of circulatory system with heart and veins — Stock Photo
    Medical illustration of circulatory system with heart and veins
    Activated T lymphocytes and red blood cells on scanning electron micrograph. — Stock Photo
    Activated T lymphocytes and red blood cells on scanning electron micrograph.
    Cardiovascular system of an adult — Stock Photo
    Cardiovascular system of an adult
    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
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Human heart and its electrical system, 3d illustration. The yellow lines demonstrate the electrical (conduction) system of the heart. The heart at right shows an irregular heartbeat (arrhythmia) and atrial fibrillation. — Stock Photo
    Human heart and its electrical system, 3d illustration. The yellow lines demonstrate the electrical (conduction) system of the heart. The heart at right shows an irregular heartbeat (arrhythmia) and atrial fibrillation.
    Erythrocytes or red blood cells — Stock Photo
    Erythrocytes or red blood cells
    Cardiovascular system of an adult — Stock Photo
    Cardiovascular system of an adult
    Human face and neck with nervous, lymphatic and circulatory systems — Stock Photo
    Human face and neck with nervous, lymphatic and circulatory systems
    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.
    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.
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Medical illustration of alveoli on black background — Stock Photo
    Medical illustration of alveoli on black background
    Medical illustration of female breast arteries, veins and lymphatic system — Stock Photo
    Medical illustration of female breast arteries, veins and lymphatic system
    Blood vessels of the arms — Stock Photo
    Blood vessels of the arms
    Medical illustration of alveoli on black background — Stock Photo
    Medical illustration of alveoli on black background
    Upper-body anatomy of adult male — Stock Photo
    Upper-body anatomy of adult male
    Shoulder blood supply — Stock Photo
    Shoulder blood supply
    Normal red blood cells — Stock Photo
    Normal red blood cells
    Medical illustration of blood vessels anatomy — Stock Photo
    Medical illustration of blood vessels anatomy
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    Chest, neck and head arteries — Stock Photo
    Chest, neck and head arteries
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Bloodstream showing red blood cells — Stock Photo
    Bloodstream showing red blood cells
    Cholesterol plaque leading to atherosclerosis — Stock Photo
    Cholesterol plaque leading to atherosclerosis
    Representation of Circulatory system — Stock Photo
    Representation of Circulatory system
    Human heart anatomy — Stock Photo
    Human heart anatomy
    Nervous and circulatory systems — Stock Photo
    Nervous and circulatory systems
    Red blood cells and leukocytes in cross-section of blood vessel, digital illustration. — Stock Photo
    Red blood cells and leukocytes in cross-section of blood vessel, digital illustration.
    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 in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Representation of human anatomy — Stock Photo
    Representation of human anatomy
    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.
    Human heart anatomy — Stock Photo
    Human heart anatomy
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Bloodstream showing red blood cells — Stock Photo
    Bloodstream showing red blood cells
    Cardiovascular system and blood vessels — Stock Photo
    Cardiovascular system and blood vessels
    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.
    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.
    Human artery showing artery walls and bloodstream — Stock Photo
    Human artery showing artery walls and bloodstream
    First-aiders practicing cardiopulmonary resuscitation on training dummy. — Stock Photo
    First-aiders practicing cardiopulmonary resuscitation on training dummy.
    Blood supply of human arm — Stock Photo
    Blood supply of human arm
    Human Platelets, computer illustration — Stock Photo
    Human Platelets, computer illustration
    Medical illustration of human heart interior — Stock Photo
    Medical illustration of human heart interior
    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.
    Human Platelets, computer illustration — Stock Photo
    Human Platelets, computer illustration
    Normal human arteries, — Stock Photo
    Normal human arteries,