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    Diseased blood cells with bacteria, computer illustration. — Stock Photo
    Diseased blood cells with bacteria, computer illustration.
    Illustration of flowing human blood cells. — Stock Photo
    Illustration of flowing human blood cells.
    Illustration of transparent human heart silhouette. — Stock Photo
    Illustration of transparent human heart silhouette.
    3d rendered illustration of diseased heart valve on white background. — Stock Photo
    3d rendered illustration of diseased heart valve on white background.
    Erythrocytes and leukocytes blood cells in human blood vessel, digital illustration. — Stock Photo
    Erythrocytes and leukocytes blood cells in human blood vessel, digital illustration.
    Illustration of female silhouette with inflamed heart. — Stock Photo
    Illustration of female silhouette with inflamed heart.
    3d rendered illustration of human heart. — Stock Photo
    3d rendered illustration of human heart.
    Illustration of heart in male body silhouette on black background. — Stock Photo
    Illustration of heart in male body silhouette on black background.
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Erythrocytes and leukocytes blood cells in human blood vessel, digital illustration. — Stock Photo
    Erythrocytes and leukocytes blood cells in human blood vessel, digital illustration.
    Blood supply of human arm — Stock Photo
    Blood supply of human arm
    Illustration of human blood cells on white background. — Stock Photo
    Illustration of human blood cells on white background.
    Diseased blood cells with bacteria, computer illustration. — Stock Photo
    Diseased blood cells with bacteria, computer illustration.
    Illustration of human heart in body silhouette. — Stock Photo
    Illustration of human heart in body silhouette.
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    3d rendered illustration of human vascular system. — Stock Photo
    3d rendered illustration of human vascular system.
    Illustration of two bypasses in human heart. — Stock Photo
    Illustration of two bypasses in human heart.
    Virus particles spreading through blood stream — Stock Photo
    Virus particles spreading through blood stream
    Light micrograph of a section through tissue showing an artery (middle ) and a vein (top left). — Stock Photo
    Light micrograph of a section through tissue showing an artery (middle ) and a vein (top left).
    Venule. Coloured transmission electron micrograph (TEM). Venules are small veins that transport deoxygenated blood from the capillary beds to the veins. Endothelial cells line the entire circulatory system — Stock Photo
    Venule. Coloured transmission electron micrograph (TEM). Venules are small veins that transport deoxygenated blood from the capillary beds to the veins. Endothelial cells line the entire circulatory system
    Representation of Circulatory system — Stock Photo
    Representation of Circulatory system
    Brain hemisphere anatomy — Stock Photo
    Brain hemisphere anatomy
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Human skin anatomy — Stock Photo
    Human skin anatomy
    Illustration of senior woman silhouette with colored heart on black background. — Stock Photo
    Illustration of senior woman silhouette with colored heart on black background.
    Human brain with network of blood vessels — Stock Photo
    Human brain with network of blood vessels
    Illustration of female silhouette with highlighted heart. — Stock Photo
    Illustration of female silhouette with highlighted heart.
    Illustration of figure of obese man with visible heart. — Stock Photo
    Illustration of figure of obese man with visible heart.
    Representation of human anatomy — Stock Photo
    Representation of human anatomy
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    Vascular system of healthy adult — Stock Photo
    Vascular system of healthy adult
    Virus particles spreading through blood stream — Stock Photo
    Virus particles spreading through blood stream
    Red blood cells (erythrocytes) in a blood vessel, illustration. — Stock Photo
    Red blood cells (erythrocytes) in a blood vessel, illustration.
    Illustration of transparent gray silhouette of male body with colored heart. — Stock Photo
    Illustration of transparent gray silhouette of male body with colored heart.
    3d rendered illustration of male cyclist heart while biking on black background. — Stock Photo
    3d rendered illustration of male cyclist heart while biking on black background.
    Illustration of heart in transparent male silhouette. — Stock Photo
    Illustration of heart in transparent male silhouette.
    Digital illustration of human alveoli on white background. — Stock Photo
    Digital illustration of human alveoli on white background.
    Illustration of silhouette of obese man with visible heart. — Stock Photo
    Illustration of silhouette of obese man with visible heart.
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    Human heart, computer illustration. — Stock Photo
    Human heart, computer illustration.
    Coronary arteries, computer illustration. — Stock Photo
    Coronary arteries, computer illustration.
    Illustration of senior woman silhouette showing heart on black background. — Stock Photo
    Illustration of senior woman silhouette showing heart on black background.
    Illustration of female silhouette with highlighted heart. — Stock Photo
    Illustration of female silhouette with highlighted heart.
    Illustration of female silhouette with painful heart. — Stock Photo
    Illustration of female silhouette with painful heart.
    Low angle view illustration of blue silhouette of obese woman with highlighted heart. — Stock Photo
    Low angle view illustration of blue silhouette of obese woman with highlighted heart.
    Illustration of senior woman silhouette with colored heart on white background. — Stock Photo
    Illustration of senior woman silhouette with colored heart on white background.
    3d rendered illustration of colored female heart in body silhouette. — Stock Photo
    3d rendered illustration of colored female heart in body silhouette.
    Virus particles spreading through blood stream — Stock Photo
    Virus particles spreading through blood stream
    3d rendered illustration of human heart. — Stock Photo
    3d rendered illustration of human heart.
    Bacteria amidst blood cells in blood vessel, digital illustration. — Stock Photo
    Bacteria amidst blood cells in blood vessel, digital illustration.
    Fat in blood cells blocking blood vessel, digital illustration. — Stock Photo
    Fat in blood cells blocking blood vessel, digital illustration.
    Human vein showing tissue stratification — Stock Photo
    Human vein showing tissue stratification
    Bacteria and viruses in human artery, digital illustration. — Stock Photo
    Bacteria and viruses in human artery, digital illustration.
    Male vascular system — Stock Photo
    Male vascular system
    Illustration of clot of human blood cells. — Stock Photo
    Illustration of clot of human blood cells.
    3d rendered illustration of blue silhouette of man with chest pain. — Stock Photo
    3d rendered illustration of blue silhouette of man with chest pain.
    Illustration of silhouette of obese man with visible heart. — Stock Photo
    Illustration of silhouette of obese man with visible heart.
    Newborn digestive and cardio-vascular systems — Stock Photo
    Newborn digestive and cardio-vascular systems
    Illustration of human heart in body silhouette. — Stock Photo
    Illustration of human heart in body silhouette.