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    Human brain with network of blood vessels — Stock Photo
    Human brain with network of blood vessels
    Blood vessels of the brain — Stock Photo
    Blood vessels of the brain
    Coloured coronary angiogram (X-ray) of a 59 year old patient with severe stenosis (narrowing) in the left anterior interventricular coronary artery (running down left) and the left circumflex artery (centre). — Stock Photo
    Coloured coronary angiogram (X-ray) of a 59 year old patient with severe stenosis (narrowing) in the left anterior interventricular coronary artery (running down left) and the left circumflex artery (centre).
    Illustration of heart and circulatory system. — Stock Photo
    Illustration of heart and circulatory system.
    Red blood cells — Stock Photo
    Red blood cells
    Wake behind a boat along the coastline of Sermersooq; Sermersooq, Greenland — Stock Photo
    Wake behind a boat along the coastline of Sermersooq; Sermersooq, Greenland
    Red blood cells on white background, digital illustration. — Stock Photo
    Red blood cells on white background, digital illustration.
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Ebola virus particles in blood, digital illustration. — Stock Photo
    Ebola virus particles in blood, digital illustration.
    Cholesterol plaque leading to atherosclerosis — Stock Photo
    Cholesterol plaque leading to atherosclerosis
    Human vascular system — Stock Photo
    Human vascular system
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    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.
    Cardiovascular system with emphasis on heart — Stock Photo
    Cardiovascular system with emphasis on heart
    Colored angiogram of carotid artery in neck of mature patient. — Stock Photo
    Colored angiogram of carotid artery in neck of mature patient.
    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.
    Normal blood cells in artery — Stock Photo
    Normal blood cells in artery
    Cardiovascular system with emphasis on heart — Stock Photo
    Cardiovascular system with emphasis on heart
    First-aider practicing cardiopulmonary resuscitation on training dummy. — Stock Photo
    First-aider practicing cardiopulmonary resuscitation on training dummy.
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Cardiovascular system and blood vessels — Stock Photo
    Cardiovascular system and blood vessels
    Human heart anatomy — Stock Photo
    Human heart anatomy
    Red blood cells on white background, digital illustration. — Stock Photo
    Red blood cells on white background, digital illustration.
    Human artery showing artery walls and bloodstream — Stock Photo
    Human artery showing artery walls and bloodstream
    Female anatomy cardiovascular system with skeleton on white background. — Stock Photo
    Female anatomy cardiovascular system with skeleton on white background.
    Human artery showing artery walls and bloodstream — Stock Photo
    Human artery showing artery walls and bloodstream
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Cardiovascular system showing veins and arteries — Stock Photo
    Cardiovascular system showing veins and arteries
    Nervous and circulatory systems — Stock Photo
    Nervous and circulatory systems
    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.
    Red blood cells — Stock Photo
    Red blood cells
    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.
    Doctors practicing chest compression on infant training dummies. — Stock Photo
    Doctors practicing chest compression on infant training dummies.
    Human brain anatomy — Stock Photo
    Human brain anatomy
    Coronary angioplasty stent insertion — Stock Photo
    Coronary angioplasty stent insertion
    Coronary angioplasty stent insertion — Stock Photo
    Coronary angioplasty stent insertion
    Normal blood vessels, X-ray — Stock Photo
    Normal blood vessels, X-ray
    Normal blood vessels, X-ray — Stock Photo
    Normal blood vessels, X-ray
    Normal human alveoli anatomy — Stock Photo
    Normal human alveoli anatomy
    Coloured transmission electron micrograph (TEM) of a transverse section through an artery. — Stock Photo
    Coloured transmission electron micrograph (TEM) of a transverse section through an artery.
    Red blood cells and protein particles, digital illustration. — Stock Photo
    Red blood cells and protein particles, digital illustration.
    Normal human arteries, — Stock Photo
    Normal human arteries,
    Nanomachines working on red blood cells, digital illustration. — Stock Photo
    Nanomachines working on red blood cells, digital illustration.
    Nanomachines working on red blood cells, digital illustration. — Stock Photo
    Nanomachines working on red blood cells, digital illustration.
    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).
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Red blood cells — Stock Photo
    Red blood cells
    Female anatomy showing cardiovascular system on white background. — Stock Photo
    Female anatomy showing cardiovascular system on white background.
    Cardiovascular system of an adult — Stock Photo
    Cardiovascular system of an adult
    Red blood cells — Stock Photo
    Red blood cells
    Malaria infection infecting red blood cells, digital illustration. — Stock Photo
    Malaria infection infecting red blood cells, digital illustration.
    Arteries and veins of the hand — Stock Photo
    Arteries and veins of the hand
    HIV human immunodeficiency virus in bloodstream, digital illustration — Stock Photo
    HIV human immunodeficiency virus in bloodstream, digital illustration
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Red blood cells on white background, digital illustration. — Stock Photo
    Red blood cells on white background, digital illustration.
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Human Platelets, computer illustration — Stock Photo
    Human Platelets, computer illustration
    Red blood cells — Stock Photo
    Red blood cells
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.