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    Close-up of blue stethoscope on white background. — Stock Photo
    Close-up of blue stethoscope on white background.
    Elementary age asthmatic girl wearing oxygen face mask. — Stock Photo
    Elementary age asthmatic girl wearing oxygen face mask.
    Nurse adjusting controls on ventilator attached to unconscious patient. — Stock Photo
    Nurse adjusting controls on ventilator attached to unconscious patient.
    Preteen boy undergoing lung function test with female nurse. — Stock Photo
    Preteen boy undergoing lung function test with female nurse.
    Asthmatic boy using inhaler, close-up. — Stock Photo
    Asthmatic boy using inhaler, close-up.
    Oxygen mask and tube on white background. — Stock Photo
    Oxygen mask and tube on white background.
    Asthmatic boy using inhaler, close-up. — Stock Photo
    Asthmatic boy using inhaler, close-up.
    Unconscious man in intensive care ward at hospital. — Stock Photo
    Unconscious man in intensive care ward at hospital.
    Girl using inhaler while male doctor watching. — Stock Photo
    Girl using inhaler while male doctor watching.
    Boy using nebulizer to treat asthma. — Stock Photo
    Boy using nebulizer to treat asthma.
    Boy using inhaler outdoors. — Stock Photo
    Boy using inhaler outdoors.
    Colored X-ray showing blood vessels in lung. — Stock Photo
    Colored X-ray showing blood vessels in lung.
    Young woman using inhaler outdoors. — Stock Photo
    Young woman using inhaler outdoors.
    Close-up of inhaler in elementary age kid. — Stock Photo
    Close-up of inhaler in elementary age kid.
    Asthmatic boy using inhaler, close-up. — Stock Photo
    Asthmatic boy using inhaler, close-up.
    Elementary age girl using inhaler. — Stock Photo
    Elementary age girl using inhaler.
    Young woman using inhaler outdoors. — Stock Photo
    Young woman using inhaler outdoors.
    Girl using inhaler while male doctor watching. — Stock Photo
    Girl using inhaler while male doctor watching.
    Senior woman using inhaler. — Stock Photo
    Senior woman using inhaler.
    Female patient with nasal cannula, portrait. — Stock Photo
    Female patient with nasal cannula, portrait.
    Female patient with nasal cannula. — Stock Photo
    Female patient with nasal cannula.
    Senior man exhaling into peak flow reader. — Stock Photo
    Senior man exhaling into peak flow reader.
    Lung tissue, coloured transmission electron micrograph (TEM). — Stock Photo
    Lung tissue, coloured transmission electron micrograph (TEM).
    Computer Illustration of male bronchi. — Stock Photo
    Computer Illustration of male bronchi.
    Coloured computed tomography (CT) scan of a section through the chest of a 76-year-old male patient with a malignant (cancerous) tumour (bright, right) of the bronchus. — Stock Photo
    Coloured computed tomography (CT) scan of a section through the chest of a 76-year-old male patient with a malignant (cancerous) tumour (bright, right) of the bronchus.
    Coloured scanning electron micrograph (SEM) of a fractured mucous membrane of the trachea (wind pipe), showing the epithelium and underlying connective tissue. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a fractured mucous membrane of the trachea (wind pipe), showing the epithelium and underlying connective tissue.
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM). — Stock Photo
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM).
    Coloured X-ray of the chest of a 52 year old female patient with metastatic (secondary) lung cancer (yellow). — Stock Photo
    Coloured X-ray of the chest of a 52 year old female patient with metastatic (secondary) lung cancer (yellow).
    Coloured computed tomography (CT) scan of a section through the chest of a 76-year-old male patient with a malignant (cancerous) tumour (bright, right) of the bronchus. — Stock Photo
    Coloured computed tomography (CT) scan of a section through the chest of a 76-year-old male patient with a malignant (cancerous) tumour (bright, right) of the bronchus.
    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).
    False-colour scanning electron micrograph of a section of healthy lung tissue, showing the microscopic air sacs (alveoli) where gas exchange takes place. — Stock Photo
    False-colour scanning electron micrograph of a section of healthy lung tissue, showing the microscopic air sacs (alveoli) where gas exchange takes place.
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM). — Stock Photo
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM).
    Coloured scanning electron micrograph (SEM) of epithelial cells lining the human trachea (windpipe). — Stock Photo
    Coloured scanning electron micrograph (SEM) of epithelial cells lining the human trachea (windpipe).
    Lung aneurysm, light micrograph. — Stock Photo
    Lung aneurysm, light micrograph.
    Illustration of internal human organs. — Stock Photo
    Illustration of internal human organs.
    Coloured scanning electron micrograph (SEM) of a fractured mucous membrane of the trachea (wind pipe), showing the epithelium and underlying connective tissue. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a fractured mucous membrane of the trachea (wind pipe), showing the epithelium and underlying connective tissue.
    Coloured computed tomography (CT) scan of a section through the chest of a 76-year-old male patient with a malignant (cancerous) tumour (bright, right) of the bronchus. — Stock Photo
    Coloured computed tomography (CT) scan of a section through the chest of a 76-year-old male patient with a malignant (cancerous) tumour (bright, right) of the bronchus.
    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.
    Human respiratory system, illustration. — Stock Photo
    Human respiratory system, illustration.
    Coloured computed tomography (CT) scan of a section through the chest of a 76-year-old male patient with a malignant (cancerous) tumour (bright, right) of the bronchus. — Stock Photo
    Coloured computed tomography (CT) scan of a section through the chest of a 76-year-old male patient with a malignant (cancerous) tumour (bright, right) of the bronchus.
    Coloured X-ray of the chest of a 52 year old female patient with metastatic (secondary) lung cancer (yellow). — Stock Photo
    Coloured X-ray of the chest of a 52 year old female patient with metastatic (secondary) lung cancer (yellow).
    Coloured X-ray of the chest of a 52 year old female patient with metastatic (secondary) lung cancer (yellow). — Stock Photo
    Coloured X-ray of the chest of a 52 year old female patient with metastatic (secondary) lung cancer (yellow).
    Pneumonia. X-ray of the chest of a patient with bacterial pneumonia (grainy white area, lower left) in the lower lobe of the right lung (left). — Stock Photo
    Pneumonia. X-ray of the chest of a patient with bacterial pneumonia (grainy white area, lower left) in the lower lobe of the right lung (left).
    Coloured X-ray of the chest of a 52 year old female patient with metastatic (secondary) lung cancer (yellow). — Stock Photo
    Coloured X-ray of the chest of a 52 year old female patient with metastatic (secondary) lung cancer (yellow).
    Lung tissue, coloured transmission electron micrograph (TEM). — Stock Photo
    Lung tissue, coloured transmission electron micrograph (TEM).
    Blood vessel in the lung — Stock Photo
    Blood vessel in the lung
    Blood vessel in the lung — Stock Photo
    Blood vessel in the lung
    Severe acute respiratory syndrome virus — Stock Photo
    Severe acute respiratory syndrome virus
    Normal male anatomy — Stock Photo
    Normal male anatomy
    Feline caliciviruses particles — Stock Photo
    Feline caliciviruses particles
    Lung cancer pathology — Stock Photo
    Lung cancer pathology
    Anatomy of person coughing — Stock Photo
    Anatomy of person coughing
    Bowel cancer pathology — Stock Photo
    Bowel cancer pathology
    Newborn body organs — Stock Photo
    Newborn body organs
    Male internal anatomy — Stock Photo
    Male internal anatomy
    Newborn head and chest anatomy — Stock Photo
    Newborn head and chest anatomy
    Human chest anatomy — Stock Photo
    Human chest anatomy
    Human alveoli anatomy — Stock Photo
    Human alveoli anatomy
    Respiratory syncytial virus — Stock Photo
    Respiratory syncytial virus
    Human alveoli anatomy — Stock Photo
    Human alveoli anatomy