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    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM). — Stock Photo
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM).
    Trachea lined with ciliated columnar epithelium — Stock Photo
    Trachea lined with ciliated columnar epithelium
    Lung cancer in female realistic body 3d model, conceptual computer illustration. — Stock Photo
    Lung cancer in female realistic body 3d model, conceptual computer illustration.
    Lungs in anatomy of male body, computer illustration. — Stock Photo
    Lungs in anatomy of male body, computer illustration.
    Close-up illustration of transparent blue silhouette of male body with colored larynx tumour. — Stock Photo
    Close-up illustration of transparent blue silhouette of male body with colored larynx tumour.
    Illustration of overweight woman with visible lungs on black background. — Stock Photo
    Illustration of overweight woman with visible lungs on black background.
    Illustration of lungs in male body silhouette on white background. — Stock Photo
    Illustration of lungs in male body silhouette on white background.
    Lungs in anatomy of male body, computer illustration. — Stock Photo
    Lungs in anatomy of male body, computer illustration.
    Transparent male silhouette with colored bronchi, computer illustration. — Stock Photo
    Transparent male silhouette with colored bronchi, computer illustration.
    Illustration of female silhouette with highlighted lungs. — Stock Photo
    Illustration of female silhouette with highlighted lungs.
    Transparent human silhouette with colored larynx, computer illustration. — Stock Photo
    Transparent human silhouette with colored larynx, computer illustration.
    Digital illustration of senior man anatomy showing lungs. — Stock Photo
    Digital illustration of senior man anatomy showing lungs.
    Whooping cough bacterium (Bordetella pertussis), illustration. These rod-shaped Gram-negative bacilli cause whooping cough, known as pertussis, mainly in infants — Stock Photo
    Whooping cough bacterium (Bordetella pertussis), illustration. These rod-shaped Gram-negative bacilli cause whooping cough, known as pertussis, mainly in infants
    Transparent human silhouette with colored larynx, computer illustration. — Stock Photo
    Transparent human silhouette with colored larynx, computer illustration.
    Illustration of senior man silhouette with visible larynx. — Stock Photo
    Illustration of senior man silhouette with visible larynx.
    Close-up illustration of trachea in male body silhouette, close-up. — Stock Photo
    Close-up illustration of trachea in male body silhouette, close-up.
    Illustration of visible lungs in transparent human body silhouette. — Stock Photo
    Illustration of visible lungs in transparent human body silhouette.
    Transparent male silhouette with colored larynx, computer illustration. — Stock Photo
    Transparent male silhouette with colored larynx, computer illustration.
    Human larynx, computer illustration — Stock Photo
    Human larynx, computer illustration
    Illustration of blue silhouette of obese woman with highlighted lungs on black background. — Stock Photo
    Illustration of blue silhouette of obese woman with highlighted lungs on black background.
    Abstract transparent male body with glowing larynx cancer, digital illustration. — Stock Photo
    Abstract transparent male body with glowing larynx cancer, digital illustration.
    Transparent male silhouette with colored lungs, computer illustration. — Stock Photo
    Transparent male silhouette with colored lungs, computer illustration.
    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.
    Diseased lungs in transparent female body on black background, computer illustration. — Stock Photo
    Diseased lungs in transparent female body on black background, computer illustration.
    Illustration of larynx in transparent male silhouette. — Stock Photo
    Illustration of larynx in transparent male silhouette.
    Horse anatomy and skeletal system, computer illustration. — Stock Photo
    Horse anatomy and skeletal system, computer illustration.
    Illustration of transparent blue silhouette of male body with colored lungs. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored lungs.
    Illustration of larynx in silhouette of female body. — Stock Photo
    Illustration of larynx in silhouette of female body.
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM). — Stock Photo
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM).
    Abstract male silhouette with lung cancer, digital illustration. — Stock Photo
    Abstract male silhouette with lung cancer, digital illustration.
    Horse anatomy with visible internal organs on white background, computer illustration. — Stock Photo
    Horse anatomy with visible internal organs on white background, computer illustration.
    3d rendered illustration of colored female lungs in body silhouette. — Stock Photo
    3d rendered illustration of colored female lungs in body silhouette.
    Illustration of transparent blue silhouette of male body with colored small intestine. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored small intestine.
    Digital illustration of senior man anatomy showing lungs. — Stock Photo
    Digital illustration of senior man anatomy showing lungs.
    Low angle view illustration of blue silhouette of obese woman with highlighted larynx on black background. — Stock Photo
    Low angle view illustration of blue silhouette of obese woman with highlighted larynx on black background.
    Illustration of human lungs in body silhouette. — Stock Photo
    Illustration of human lungs in body silhouette.
    Illustration of transparent blue silhouette of male body with colored larynx. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored larynx.
    Colored lungs in transparent female body on black background, computer illustration. — Stock Photo
    Colored lungs in transparent female body on black background, computer illustration.
    Trachea lining. Coloured transmission electron micrograph (TEM) of a longitudinal section through the lining of the trachea (windpipe), which links the larynx (voicebox) to the lungs — Stock Photo
    Trachea lining. Coloured transmission electron micrograph (TEM) of a longitudinal section through the lining of the trachea (windpipe), which links the larynx (voicebox) to the lungs
    Female larynx, anatomical digital illustration. — Stock Photo
    Female larynx, anatomical digital illustration.
    Illustration of human silhouette with inflamed larynx. — Stock Photo
    Illustration of human silhouette with inflamed larynx.
    Human lungs with pneumonia and close-up of bacteria and viruses. — Stock Photo
    Human lungs with pneumonia and close-up of bacteria and viruses.
    Illustration of blue silhouette of obese woman with highlighted larynx. — Stock Photo
    Illustration of blue silhouette of obese woman with highlighted larynx.
    Vascular system with major veins and arteries — Stock Photo
    Vascular system with major veins and arteries
    Transparent male silhouette with colored lungs, computer illustration. — Stock Photo
    Transparent male silhouette with colored lungs, computer illustration.
    Illustration of female silhouette with highlighted larynx. — Stock Photo
    Illustration of female silhouette with highlighted larynx.
    Illustration of silhouette of obese man with visible lungs. — Stock Photo
    Illustration of silhouette of obese man with visible lungs.
    Lung cancer in female transparent body, conceptual computer illustration. — Stock Photo
    Lung cancer in female transparent body, conceptual computer illustration.
    Illustration of transparent blue silhouette of male body with colored bronchi. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored bronchi.
    Abstract male body with sore throat on white background, conceptual digital illustration. — Stock Photo
    Abstract male body with sore throat on white background, conceptual digital illustration.
    Digital illustration of senior man anatomy showing lungs. — Stock Photo
    Digital illustration of senior man anatomy showing lungs.
    Illustration of visible colored lungs in transparent human body silhouette. — Stock Photo
    Illustration of visible colored lungs in transparent human body silhouette.
    Illustration of senior woman silhouette with colored larynx on black background. — Stock Photo
    Illustration of senior woman silhouette with colored larynx on black background.
    Digital illustration of cancerous tumor in lungs and close-up of lung cancer cells. — Stock Photo
    Digital illustration of cancerous tumor in lungs and close-up of lung cancer cells.
    Illustration of cancerous tumour in female lung. — Stock Photo
    Illustration of cancerous tumour in female lung.
    Illustration of senior woman blue silhouette with highlighted larynx on white background. — Stock Photo
    Illustration of senior woman blue silhouette with highlighted larynx on white background.
    Illustration of transparent blue silhouette of male body with colored lungs. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored lungs.
    Horse anatomy and skeletal system, computer illustration. — Stock Photo
    Horse anatomy and skeletal system, computer illustration.
    Transparent male silhouette with colored lungs, computer illustration. — Stock Photo
    Transparent male silhouette with colored lungs, computer illustration.
    Bacterial sinusitis, computer illustration. The sinuses are membrane-lined air-filled spaces in the bones of the face. The frontal sinuses are above the eyes. Below these are the many lobed ethmoid sinuses and behind them the sphenoid sinuses — Stock Photo
    Bacterial sinusitis, computer illustration. The sinuses are membrane-lined air-filled spaces in the bones of the face. The frontal sinuses are above the eyes. Below these are the many lobed ethmoid sinuses and behind them the sphenoid sinuses