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    Normal red blood cells — Stock Photo
    Normal red blood cells
    Ebola virus particles in blood, digital illustration. — Stock Photo
    Ebola virus particles in blood, digital illustration.
    Adult male structural anatomy — Stock Photo
    Adult male structural anatomy
    Blood pressure and circulatory system with labels — Stock Photo
    Blood pressure and circulatory system with labels
    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).
    Normal blood cells in artery — Stock Photo
    Normal blood cells in artery
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Arteries and veins of the hand — Stock Photo
    Arteries and veins of the hand
    Doctor practicing chest compression on cardiopulmonary resuscitation training dummy. — Stock Photo
    Doctor practicing chest compression on cardiopulmonary resuscitation training dummy.
    Visual rendering of Heart anatomy — Stock Photo
    Visual rendering of Heart anatomy
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Cardiovascular system of an adult — Stock Photo
    Cardiovascular system of an adult
    Human artery showing artery walls and bloodstream — Stock Photo
    Human artery showing artery walls and bloodstream
    Female anatomy showing cardiovascular system on white background. — Stock Photo
    Female anatomy showing cardiovascular system on white background.
    Blood clot, computer illustration — Stock Photo
    Blood clot, computer illustration
    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.
    Anatomy of human kidney function — Stock Photo
    Anatomy of human kidney function
    Human anatomy emphasizing upper-body — Stock Photo
    Human anatomy emphasizing upper-body
    Human foot with nervous, lymphatic and circulatory systems — Stock Photo
    Human foot with nervous, lymphatic and circulatory systems
    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).
    Medical illustration of male skeleton with ureter system — Stock Photo
    Medical illustration of male skeleton with ureter 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
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Representation of human anatomy — Stock Photo
    Representation of human anatomy
    Human skeleton with organs and circulatory system — Stock Photo
    Human skeleton with organs and circulatory system
    Cardiovascular system and blood vessels — Stock Photo
    Cardiovascular system and blood vessels
    Bloodstream showing red blood cells — Stock Photo
    Bloodstream showing red blood cells
    Red blood cells — Stock Photo
    Red blood cells
    Circulatory system and blood supply — Stock Photo
    Circulatory system and 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).
    Red blood cells and white blood cells — Stock Photo
    Red blood cells and white blood cells
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Blood supply of human arm — Stock Photo
    Blood supply of human arm
    Medical illustration of arteries, veins and lymphatic system in human hand and arm — Stock Photo
    Medical illustration of arteries, veins and lymphatic system in human hand and arm
    Narrowed artery causing atherosclerosis — Stock Photo
    Narrowed artery causing atherosclerosis
    Blood supply network of human head — Stock Photo
    Blood supply network of human head
    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
    Medical illustration of head arteries, veins and lymphatic system — Stock Photo
    Medical illustration of head arteries, veins and lymphatic system
    Human heart anatomy — Stock Photo
    Human heart anatomy
    Bloodstream showing red blood cells — Stock Photo
    Bloodstream showing red blood cells
    Cardiovascular system of an adult — Stock Photo
    Cardiovascular system of an adult
    Human structural anatomy — Stock Photo
    Human structural anatomy
    HIV human immunodeficiency virus in bloodstream, digital illustration — Stock Photo
    HIV human immunodeficiency virus in bloodstream, digital illustration
    Human artery showing artery walls and bloodstream — Stock Photo
    Human artery showing artery walls and bloodstream
    Cardiovascular system with emphasis on heart — Stock Photo
    Cardiovascular system with emphasis on heart
    Human vein showing tissue stratification — Stock Photo
    Human vein showing tissue stratification
    Human vein showing tissue stratification — Stock Photo
    Human vein showing tissue stratification
    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
    Cross-section of human artery — Stock Photo
    Cross-section of human 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.
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Red blood cells — Stock Photo
    Red blood cells
    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.
    Nanomachines working on red blood cells, digital illustration. — Stock Photo
    Nanomachines working on red blood cells, digital illustration.
    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.
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Human cardiovascular system — Stock Photo
    Human cardiovascular system