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    Structure of neutrophil white blood cell, digital illustration. — Stock Photo
    Structure of neutrophil white blood cell, digital illustration.
    Digital illustration of human leg affected by lymphatic filariasis and close-up of microfilaria worm parasite. — Stock Photo
    Digital illustration of human leg affected by lymphatic filariasis and close-up of microfilaria worm parasite.
    Neutrophil white blood cell in blood, digital artwork. — Stock Photo
    Neutrophil white blood cell in blood, digital artwork.
    Mast cell releasing histamine during allergic response, digital illustration. — Stock Photo
    Mast cell releasing histamine during allergic response, digital illustration.
    Mast cell releasing histamine during allergic response, digital illustration. — Stock Photo
    Mast cell releasing histamine during allergic response, digital illustration.
    Scanning electron microscopy of DNA molecules and red and white blood cells. — Stock Photo
    Scanning electron microscopy of DNA molecules and red and white blood cells.
    Scanning electron microscopy of DNA molecules and red and white blood cells. — Stock Photo
    Scanning electron microscopy of DNA molecules and red and white blood cells.
    Scanning electron microscopy of DNA molecules and red and white blood cells. — Stock Photo
    Scanning electron microscopy of DNA molecules and red and white blood cells.
    Colored angiogram of carotid artery in neck of mature patient. — Stock Photo
    Colored angiogram of carotid artery in neck of mature patient.
    Red blood cells, digital illustration. — Stock Photo
    Red blood cells, digital illustration.
    Illustration of low density cholesterol lipoprotein in bloodstream. — Stock Photo
    Illustration of low density cholesterol lipoprotein in bloodstream.
    Colored angiogram of carotid artery in neck of mature patient. — Stock Photo
    Colored angiogram of carotid artery in neck of mature patient.
    Colored X-ray showing blood vessels in lung. — Stock Photo
    Colored X-ray showing blood vessels in lung.
    Digital illustration of immunoglobulin in blood. — Stock Photo
    Digital illustration of immunoglobulin in blood.
    Lung tissue, coloured transmission electron micrograph (TEM). — Stock Photo
    Lung tissue, coloured transmission electron micrograph (TEM).
    Narrowed blood vessel, computer illustration. — Stock Photo
    Narrowed blood vessel, computer illustration.
    Normal leg veins, coloured angiogram - blood vessel X-ray — Stock Photo
    Normal leg veins, coloured angiogram - blood vessel X-ray
    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 red blood cells trapped in a fibrin blood clot, coloured scanning electron micrograph (SEM). — Stock Photo
    Human red blood cells trapped in a fibrin blood clot, coloured scanning electron micrograph (SEM).
    Coloured magnetic resonance angiogram (MRA) of the arteries (white) supplying the kidneys (blue, upper left and right). — Stock Photo
    Coloured magnetic resonance angiogram (MRA) of the arteries (white) supplying the kidneys (blue, upper left and right).
    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.
    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).
    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.
    Light micrograph (LM) showing blood supply to muscle fibers. — Stock Photo
    Light micrograph (LM) showing blood supply to muscle fibers.
    Coloured angiogram (blood vessel X-ray) of arteries in the pelvic region. — Stock Photo
    Coloured angiogram (blood vessel X-ray) of arteries in the pelvic region.
    Lung aneurysm, light micrograph. — Stock Photo
    Lung aneurysm, light micrograph.
    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).
    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.
    Leucocyte cell capturing harmful bacteria, computer illustration. — Stock Photo
    Leucocyte cell capturing harmful bacteria, computer illustration.
    Light micrograph (LM) of a vertical section through the pseudostratified columnar epithelium from the trachea, the tube in the throat leading from the mouth to the bronchus and the lungs. — Stock Photo
    Light micrograph (LM) of a vertical section through the pseudostratified columnar epithelium from the trachea, the tube in the throat leading from the mouth to the bronchus and the lungs.
    Section of a muscular artery — Stock Photo
    Section of a muscular artery
    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).
    Coloured scanning electron micrograph (SEM) of a fractured bile duct. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a fractured bile duct.
    Leucocyte cell capturing harmful bacteria, computer illustration. — Stock Photo
    Leucocyte cell capturing harmful bacteria, computer illustration.
    Light micrograph (LM) showing blood supply to muscle fibers. — Stock Photo
    Light micrograph (LM) showing blood supply to muscle fibers.
    Blood cells in a blood vessel — Stock Photo
    Blood cells in a blood vessel
    Coloured scanning electron micrograph (SEM) of a fractured bile duct. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a fractured bile duct.
    Coloured scanning electron micrograph (SEM) of a section through a foetal vein filled with red blood cells (erythrocytes, red). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through a foetal vein filled with red blood cells (erythrocytes, red).
    Lung tissue, coloured transmission electron micrograph (TEM). — Stock Photo
    Lung tissue, coloured transmission electron micrograph (TEM).
    Kidney glomerulus and podocyte cells — Stock Photo
    Kidney glomerulus and podocyte cells
    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).
    Kidney glomerulus and podocyte cells — Stock Photo
    Kidney glomerulus and podocyte cells
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Kidney glomeruli, coloured scanning electron micrograph (SEM). — Stock Photo
    Kidney glomeruli, coloured scanning electron micrograph (SEM).
    Blood vessel in the lung — Stock Photo
    Blood vessel in the lung
    Normal human renal artery — Stock Photo
    Normal human renal artery
    Kidney glomerulus and podocyte cells — Stock Photo
    Kidney glomerulus and podocyte cells
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Mucosa of the trachea — Stock Photo
    Mucosa of the trachea
    Wall of a muscular artery — Stock Photo
    Wall of a muscular artery
    Blood cells in a blood vessel — Stock Photo
    Blood cells in a blood vessel
    Arteries and veins of the hand — Stock Photo
    Arteries and veins of the hand
    Healthy kidneys and abdominal aorta — Stock Photo
    Healthy kidneys and abdominal aorta
    Pathological anatomy of atherosclerosis — Stock Photo
    Pathological anatomy of atherosclerosis
    Heart of glass anatomy — Stock Photo
    Heart of glass anatomy
    Arteries and veins of the hand — Stock Photo
    Arteries and veins of the hand
    Human heart anatomy — Stock Photo
    Human heart anatomy
    Cut in an artery seen from its interior — Stock Photo
    Cut in an artery seen from its interior
    Visual rendering of Heart anatomy — Stock Photo
    Visual rendering of Heart anatomy
    Red blood cells in an artery — Stock Photo
    Red blood cells in an artery