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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.
    Wake behind a boat along the coastline of Sermersooq; Sermersooq, Greenland — Stock Photo
    Wake behind a boat along the coastline of Sermersooq; Sermersooq, Greenland
    Healthy red blood cells — Stock Photo
    Healthy red blood cells
    Medical illustration of artificial heart valve. — Stock Photo
    Medical illustration of artificial heart valve.
    Human anatomical structure — Stock Photo
    Human anatomical structure
    Cardiovascular system and blood vessels — Stock Photo
    Cardiovascular system and blood vessels
    Normal blood vessels, X-ray — Stock Photo
    Normal blood vessels, X-ray
    Anatomy of a human heart, front and side view, 3d illustration. — Stock Photo
    Anatomy of a human heart, front and side view, 3d illustration.
    Human Platelets, computer illustration — Stock Photo
    Human Platelets, computer illustration
    Normal cardiovascular system — Stock Photo
    Normal cardiovascular system
    Arteries of cardiovascular system and skeletal structure — Stock Photo
    Arteries of cardiovascular system and skeletal structure
    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.
    Cross-section of human artery — Stock Photo
    Cross-section of human artery
    Normal blood vessels, X-ray — Stock Photo
    Normal blood vessels, X-ray
    Chest, neck and head arteries — Stock Photo
    Chest, neck and head arteries
    Human heart anatomy — Stock Photo
    Human heart anatomy
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    Medical illustration of artificial heart valve. — Stock Photo
    Medical illustration of artificial heart valve.
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Human red blood cells — Stock Photo
    Human red blood cells
    Human blood cells, computer illustration — Stock Photo
    Human blood cells, computer illustration
    Normal blood cells in artery — Stock Photo
    Normal blood cells in artery
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    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.
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    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.
    Cholesterol plaque leading to atherosclerosis — Stock Photo
    Cholesterol plaque leading to atherosclerosis
    Medical illustration of artificial heart valve. — Stock Photo
    Medical illustration of artificial heart valve.
    Normal human arteries, — Stock Photo
    Normal human arteries,
    3D rendering of digestive and male reproductive systems — Stock Photo
    3D rendering of digestive and male reproductive systems
    Ebola virus particles in blood, digital illustration. — Stock Photo
    Ebola virus particles in blood, digital illustration.
    Red blood cells and protein particles, digital illustration. — Stock Photo
    Red blood cells and protein particles, digital illustration.
    Medical illustration of female arteries, veins and lymphatic system — Stock Photo
    Medical illustration of female arteries, veins and lymphatic system
    Medical illustration of arteries, veins and lymphatic system in human legs and feet — Stock Photo
    Medical illustration of arteries, veins and lymphatic system in human legs and feet
    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.
    Red blood cells and white blood cells — Stock Photo
    Red blood cells and white blood cells
    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.
    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).
    Red blood cells, digital illustration. — Stock Photo
    Red blood cells, digital illustration.
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Human brain anatomy — Stock Photo
    Human brain anatomy
    Human vascular system — Stock Photo
    Human vascular system
    Medical illustration of alveoli on black background — Stock Photo
    Medical illustration of alveoli on black background
    Human brain anatomy — Stock Photo
    Human brain anatomy
    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.
    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.
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    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 artery showing artery walls and bloodstream — Stock Photo
    Human artery showing artery walls and bloodstream
    Healthy cardiovascular system — Stock Photo
    Healthy cardiovascular system
    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).
    Three dimensional medical illustration of male reproductive system with veins and arteries — Stock Photo
    Three dimensional medical illustration of male reproductive system with veins and arteries
    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
    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.
    Healthy red blood cells — Stock Photo
    Healthy red blood cells
    Medical illustration of arteries, veins and lymphatic system in female midsection — Stock Photo
    Medical illustration of arteries, veins and lymphatic system in female midsection
    Human artery showing artery walls and bloodstream — Stock Photo
    Human artery showing artery walls and bloodstream
    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.