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    Illustration of transparent blue silhouette of male body with colored heart. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored heart.
    Human heart model on white background, computer illustration. — Stock Photo
    Human heart model on white background, computer illustration.
    Coronary blood vessels in blue human heart model, digital illustration. — Stock Photo
    Coronary blood vessels in blue human heart model, digital illustration.
    Lobar pneumonia in stage of grey hepatisation or late consolidation, digital illustration and light micrograph. — Stock Photo
    Lobar pneumonia in stage of grey hepatisation or late consolidation, digital illustration and light micrograph.
    Female anatomy showing heart in transparent body silhouette, computer illustration. — Stock Photo
    Female anatomy showing heart in transparent body silhouette, computer illustration.
    Vascular system of female upper body, computer illustration. — Stock Photo
    Vascular system of female upper body, computer illustration.
    Transparent male silhouette with visible bronchi, computer illustration. — Stock Photo
    Transparent male silhouette with visible bronchi, computer illustration.
    Human heart with disease, computer illustration. — Stock Photo
    Human heart with disease, computer illustration.
    Vascular system of female upper body, computer illustration. — Stock Photo
    Vascular system of female upper body, computer illustration.
    Cardiovascular system in normal male body, computer illustration. — Stock Photo
    Cardiovascular system in normal male body, computer illustration.
    3d rendered illustration of colored female bronchi in body silhouette. — Stock Photo
    3d rendered illustration of colored female bronchi in body silhouette.
    Lobar pneumonia in stage of red hepatisation, digital illustration and light micrograph. — Stock Photo
    Lobar pneumonia in stage of red hepatisation, digital illustration and light micrograph.
    Composite image of nasal epithelium and pollen. Coloured Scanning Electron Micrograph (SEM) of the surface of nasal epithelium with inhaled in pollen. — Stock Photo
    Composite image of nasal epithelium and pollen. Coloured Scanning Electron Micrograph (SEM) of the surface of nasal epithelium with inhaled in pollen.
    Male abdominal blood vessels, digital illustration. — Stock Photo
    Male abdominal blood vessels, digital illustration.
    Diseased lungs in transparent female body on black background, computer illustration. — Stock Photo
    Diseased lungs in transparent female body on black background, computer illustration.
    Human body model showing male anatomy and blood vessels, digital illustration. — Stock Photo
    Human body model showing male anatomy and blood vessels, digital illustration.
    Healthy cardiovascular system — Stock Photo
    Healthy cardiovascular system
    Illustration of bronchi in transparent male silhouette. — Stock Photo
    Illustration of bronchi in transparent male silhouette.
    Human heart model on blue background, computer illustration. — Stock Photo
    Human heart model on blue background, computer illustration.
    Illustration of transparent blue silhouette of male body with colored heart tumour. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored heart tumour.
    Female body with visible vascular system, digital illustration. — Stock Photo
    Female body with visible vascular system, digital illustration.
    Female silhouette showing heart anatomy, computer illustration. — Stock Photo
    Female silhouette showing heart anatomy, computer illustration.
    Red human heart on black background, computer illustration. — Stock Photo
    Red human heart on black background, computer illustration.
    Human bronchi and heart, illustration — Stock Photo
    Human bronchi and heart, illustration
    Illustration of senior woman silhouette showing lungs on black background. — Stock Photo
    Illustration of senior woman silhouette showing lungs on black background.
    Female body with visible heart and vascular system, digital illustration — Stock Photo
    Female body with visible heart and vascular system, digital illustration
    Transparent male silhouette with colored bronchi, computer illustration. — Stock Photo
    Transparent male silhouette with colored bronchi, computer illustration.
    Male body with visible vascular system, computer illustration. — Stock Photo
    Male body with visible vascular system, computer illustration.
    Realistic human heart model on black background, computer illustration. — Stock Photo
    Realistic human heart model on black background, computer illustration.
    Human bronchi and heart, illustration — Stock Photo
    Human bronchi and heart, illustration
    Orange colored lungs in male body silhouette, computer illustration. — Stock Photo
    Orange colored lungs in male body silhouette, computer illustration.
    Illustration of heart in male body silhouette. — Stock Photo
    Illustration of heart in male body silhouette.
    Orange colored lungs in male body silhouette, computer illustration. — Stock Photo
    Orange colored lungs in male body silhouette, computer illustration.
    Low angle view illustration of blue silhouette of obese woman with highlighted lungs on black background. — Stock Photo
    Low angle view illustration of blue silhouette of obese woman with highlighted lungs on black background.
    Male abdominal blood vessels, digital illustration. — Stock Photo
    Male abdominal blood vessels, digital illustration.
    Female heart and vascular system, digital illustration. — Stock Photo
    Female heart and vascular system, digital illustration.
    Lobar pneumonia in stage of red hepatisation, digital illustration and light micrograph. — Stock Photo
    Lobar pneumonia in stage of red hepatisation, digital illustration and light micrograph.
    Female anatomy showing vascular system, digital illustration. — Stock Photo
    Female anatomy showing vascular system, digital illustration.
    Realistic human heart and blood vessels on white background, digital illustration. — Stock Photo
    Realistic human heart and blood vessels on white background, digital illustration.
    Low angle view illustration of blue silhouette of obese woman with highlighted lungs. — Stock Photo
    Low angle view illustration of blue silhouette of obese woman with highlighted lungs.
    Male body with visible vascular system, computer illustration. — Stock Photo
    Male body with visible vascular system, computer illustration.
    Diseased lungs in transparent male body on black background, computer illustration. — Stock Photo
    Diseased lungs in transparent male body on black background, computer illustration.
    Male head and neck anatomy and blood vessels, computer illustration. — Stock Photo
    Male head and neck anatomy and blood vessels, computer illustration.
    Illustration of bronchi in transparent male silhouette. — Stock Photo
    Illustration of bronchi in transparent male silhouette.
    Abstract male body with visible lymphatic system and heart, computer illustration. — Stock Photo
    Abstract male body with visible lymphatic system and heart, computer illustration.
    Vascular system of human head, computer illustration. — Stock Photo
    Vascular system of human head, computer illustration.
    Illustration of visible yellow colored lungs in transparent human body silhouette. — Stock Photo
    Illustration of visible yellow colored lungs in transparent human body silhouette.
    Transparent male silhouette with colored lungs, computer illustration. — Stock Photo
    Transparent male silhouette with colored lungs, computer illustration.
    Red human heart on black background, computer illustration. — Stock Photo
    Red human heart on black background, computer illustration.
    Female body with visible heart and cardiovascular system, digital illustration. — Stock Photo
    Female body with visible heart and cardiovascular system, digital illustration.
    Realistic human heart model on black background, computer illustration. — Stock Photo
    Realistic human heart model on black background, computer illustration.
    3d rendered illustration of male cyclist heart while biking on black background. — Stock Photo
    3d rendered illustration of male cyclist heart while biking on black background.
    Realistic human heart and blood vessels on white background, digital illustration. — Stock Photo
    Realistic human heart and blood vessels on white background, digital illustration.
    Male abdominal blood vessels, digital illustration. — Stock Photo
    Male abdominal blood vessels, digital illustration.
    Illustration of Streptococcus pneumoniae bacteria inside alveoli of lungs causing pneumonia. — Stock Photo
    Illustration of Streptococcus pneumoniae bacteria inside alveoli of lungs causing pneumonia.
    Realistic human heart model on black background, computer illustration. — Stock Photo
    Realistic human heart model on black background, computer illustration.
    Illustration of senior woman blue silhouette with highlighted lungs on black background. — Stock Photo
    Illustration of senior woman blue silhouette with highlighted lungs on black background.
    Human silhouette with infected lungs with Pulmonary blastomycosis and close-up of Blastomyces dermatitidis fungus particles. — Stock Photo
    Human silhouette with infected lungs with Pulmonary blastomycosis and close-up of Blastomyces dermatitidis fungus particles.
    Male upper body anatomy and blood vessels, computer illustration. — Stock Photo
    Male upper body anatomy and blood vessels, computer illustration.
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung — Stock Photo
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung