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    Red blood cells in an artery — Stock Photo
    Red blood cells in an artery
    3d illustrations of the human heart with lines demonstrating blood flow. — Stock Photo
    3d illustrations of the human heart with lines demonstrating blood flow.
    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.
    Cross-section of human artery — Stock Photo
    Cross-section of human artery
    Doctor practicing chest compression on cardiopulmonary resuscitation training dummy. — Stock Photo
    Doctor practicing chest compression on cardiopulmonary resuscitation training dummy.
    Human artery showing artery walls and bloodstream — Stock Photo
    Human artery showing artery walls and bloodstream
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Brain's blood supply — Stock Photo
    Brain's blood supply
    Cholesterol plaque leading to atherosclerosis — Stock Photo
    Cholesterol plaque leading to atherosclerosis
    Newborn digestive and cardio-vascular systems — Stock Photo
    Newborn digestive and cardio-vascular systems
    Medical illustration of head arteries, veins and lymphatic system — Stock Photo
    Medical illustration of head arteries, veins and lymphatic system
    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 heart anatomy — Stock Photo
    Human heart anatomy
    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
    Colored angiogram of carotid artery in neck of mature patient. — Stock Photo
    Colored angiogram of carotid artery in neck of mature patient.
    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.
    Cardiovascular system with emphasis on heart — Stock Photo
    Cardiovascular system with emphasis on heart
    Human Platelets, computer illustration — Stock Photo
    Human Platelets, computer illustration
    Human anatomy emphasizing upper-body — Stock Photo
    Human anatomy emphasizing upper-body
    Visual rendering of Heart anatomy — Stock Photo
    Visual rendering of Heart anatomy
    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
    Human brain with network of blood vessels — Stock Photo
    Human brain with network of blood vessels
    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.
    First-aider practicing cardiopulmonary resuscitation on training dummy. — Stock Photo
    First-aider practicing cardiopulmonary resuscitation on training dummy.
    Red blood cells, digital illustration. — Stock Photo
    Red blood cells, digital illustration.
    Atherosclerosis and narrowed artery — Stock Photo
    Atherosclerosis and narrowed artery
    Circulatory system and blood supply — Stock Photo
    Circulatory system and blood supply
    Healthy kidney anatomy — Stock Photo
    Healthy kidney anatomy
    Red blood cells — Stock Photo
    Red blood cells
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Entangled red blood vessels, digital illustration. — Stock Photo
    Entangled red blood vessels, digital illustration.
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Chest, neck and head arteries — Stock Photo
    Chest, neck and head arteries
    Cholesterol plaque leading to atherosclerosis — Stock Photo
    Cholesterol plaque leading to atherosclerosis
    Human veins anatomy — Stock Photo
    Human veins anatomy
    Human heart anatomy — Stock Photo
    Human heart 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.
    Brain hemisphere anatomy — Stock Photo
    Brain hemisphere anatomy
    Anatomy of female kidneys reproductive organs — Stock Photo
    Anatomy of female kidneys reproductive organs
    Red blood cells, digital illustration. — Stock Photo
    Red blood cells, digital illustration.
    Doctor practicing chest compression on cardiopulmonary resuscitation training dummy. — Stock Photo
    Doctor practicing chest compression on cardiopulmonary resuscitation training dummy.
    Blood clot, computer illustration — Stock Photo
    Blood clot, computer illustration
    Vascular system of healthy adult — Stock Photo
    Vascular system of healthy adult
    Human foot with nervous, lymphatic and circulatory systems — Stock Photo
    Human foot with nervous, lymphatic and circulatory systems
    Medical illustration of alveoli on black background — Stock Photo
    Medical illustration of alveoli on black background
    Pathophysiology of diabetic foot ulcers — Stock Photo
    Pathophysiology of diabetic foot ulcers
    Ruptured venule running through fatty tissue — Stock Photo
    Ruptured venule running through fatty tissue
    Female cardiovascular system on white background. — Stock Photo
    Female cardiovascular system on white background.
    HIV human immunodeficiency virus in bloodstream, digital illustration — Stock Photo
    HIV human immunodeficiency virus in bloodstream, digital illustration
    Coronary blood vessels of the heart — Stock Photo
    Coronary blood vessels of the heart
    Brain's blood supply — Stock Photo
    Brain's blood supply
    Female anatomy showing cardiovascular system on white background. — Stock Photo
    Female anatomy showing cardiovascular system on white background.
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    Human anatomical structure — Stock Photo
    Human anatomical structure
    Medical illustration of alveoli on black background — Stock Photo
    Medical illustration of alveoli on black background
    Malaria infection infecting red blood cells, digital illustration. — Stock Photo
    Malaria infection infecting red blood cells, digital illustration.
    Anatomy of bowman glomerular capsule — Stock Photo
    Anatomy of bowman glomerular capsule
    Cholesterol plaque leading to atherosclerosis — Stock Photo
    Cholesterol plaque leading to atherosclerosis
    Doctor practicing chest compression on cardiopulmonary resuscitation training dummy. — Stock Photo
    Doctor practicing chest compression on cardiopulmonary resuscitation training dummy.