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    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
    Shoulder blood supply — Stock Photo
    Shoulder blood supply
    Red blood cells — Stock Photo
    Red blood cells
    Bones and blood supply system of skull — Stock Photo
    Bones and blood supply system of skull
    Upper-body anatomy of adult male — Stock Photo
    Upper-body anatomy of adult male
    Human skin anatomy and blood supply — Stock Photo
    Human skin anatomy and blood supply
    Cardiovascular system of an adult — Stock Photo
    Cardiovascular system of an adult
    Cervical spine and blood supply system — Stock Photo
    Cervical spine and blood supply system
    Arteries of the human brain — Stock Photo
    Arteries of the human brain
    Nanorobot on red blood cell — Stock Photo
    Nanorobot on red blood cell
    Normal cardiovascular system — Stock Photo
    Normal cardiovascular system
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Red blood cells and blood vessel — Stock Photo
    Red blood cells and blood vessel
    Human heart anatomy — Stock Photo
    Human heart anatomy
    Blood supply network of human head — Stock Photo
    Blood supply network of human head
    Coloured angiogram (blood vessel X-ray) of the coronary arteries of a 52 year old patient. The artery at right has had a stent placed in it to treat a blockage. — Stock Photo
    Coloured angiogram (blood vessel X-ray) of the coronary arteries of a 52 year old patient. The artery at right has had a stent placed in it to treat a blockage.
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Brain's blood supply — Stock Photo
    Brain's blood supply
    Human femur structural anatomy — Stock Photo
    Human femur structural anatomy
    Cardiovascular system and blood vessels — Stock Photo
    Cardiovascular system and blood vessels
    Light micrograph (LM) showing blood supply to muscle fibers. — Stock Photo
    Light micrograph (LM) showing blood supply to muscle fibers.
    Arteries and veins of the hand — Stock Photo
    Arteries and veins of the hand
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Medical nanorobot in blood vessel, digital illustration. — Stock Photo
    Medical nanorobot in blood vessel, digital illustration.
    Blood vessel network of human head and brain — Stock Photo
    Blood vessel network of human head and brain
    Blood supply network of human head — Stock Photo
    Blood supply network of human head
    Cardiovascular system with emphasis on heart — Stock Photo
    Cardiovascular system with emphasis on heart
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Oil and natural gas platform — Stock Photo
    Oil and natural gas platform
    Adult male anatomy — Stock Photo
    Adult male anatomy
    Red blood cells and blood vessel — Stock Photo
    Red blood cells and blood vessel
    Arteries and veins of the hand — Stock Photo
    Arteries and veins of the hand
    Medical illustration of human blood vessels of head. — Stock Photo
    Medical illustration of human blood vessels of head.
    Pathological anatomy of Stroke — Stock Photo
    Pathological anatomy of Stroke
    Blood vessel in the lung — Stock Photo
    Blood vessel in the lung
    Blood supply of human arm — Stock Photo
    Blood supply of human arm
    3D computed tomography (CT) scan of normal arteries in the brain of a 35 year old. — Stock Photo
    3D computed tomography (CT) scan of normal arteries in the brain of a 35 year old.
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Vascular system and skeleton of an adult — Stock Photo
    Vascular system and skeleton of an adult
    Brain's blood supply — Stock Photo
    Brain's blood supply
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Human heart anatomy — Stock Photo
    Human heart anatomy
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Human skin anatomy and blood supply — Stock Photo
    Human skin anatomy and blood supply
    Light micrograph (LM) showing blood supply to muscle fibers. — Stock Photo
    Light micrograph (LM) showing blood supply to muscle fibers.
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Blood vessel in the lung — Stock Photo
    Blood vessel in the lung
    Muscular system of pelvic region — Stock Photo
    Muscular system of pelvic region
    Medical nanorobot in blood vessel, digital illustration. — Stock Photo
    Medical nanorobot in blood vessel, digital illustration.
    Skeletal and cardiovascular systems of adult — Stock Photo
    Skeletal and cardiovascular systems of adult
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Healthy cardiovascular system — Stock Photo
    Healthy cardiovascular system
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Cardiovascular system showing veins and arteries — Stock Photo
    Cardiovascular system showing veins and arteries
    Cardiovascular system of an adult — Stock Photo
    Cardiovascular system of an adult
    Male anatomy with tissue and systems — Stock Photo
    Male anatomy with tissue and systems
    Blood supply network of human head — Stock Photo
    Blood supply network of human head
    Cerebellum and corpus callosum — Stock Photo
    Cerebellum and corpus callosum