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    Helianthus stem. Light micrograph (LM) of stem of perennial sunflower (Helianthus sp.) in cross-section showing vascular bundles (green, yellow). Vascular tissues transport water and dissolved substances inside plant — Stock Photo
    Helianthus stem. Light micrograph (LM) of stem of perennial sunflower (Helianthus sp.) in cross-section showing vascular bundles (green, yellow). Vascular tissues transport water and dissolved substances inside plant
    Narrowed artery causing atherosclerosis — Stock Photo
    Narrowed artery causing atherosclerosis
    Illustration of human heart in body silhouette. — Stock Photo
    Illustration of human heart in body silhouette.
    Female body showing neck anatomy, computer illustration. — Stock Photo
    Female body showing neck anatomy, computer illustration.
    Anatomical male model showing lymphatic system, digital illustration. — Stock Photo
    Anatomical male model showing lymphatic system, digital illustration.
    Human heart model on blue background, computer illustration. — Stock Photo
    Human heart model on blue background, computer illustration.
    Illustration of realistic human heart with 2 bypasses. — Stock Photo
    Illustration of realistic human heart with 2 bypasses.
    Illustration of yellow heart on blue background. — Stock Photo
    Illustration of yellow heart on blue background.
    Male head and neck anatomy and blood vessels, computer illustration. — Stock Photo
    Male head and neck anatomy and blood vessels, computer illustration.
    Human alveoli anatomy — Stock Photo
    Human alveoli anatomy
    Healthy female vascular system, computer illustration — Stock Photo
    Healthy female vascular system, computer illustration
    Sea Purslane (Sesuvium portulacastrum) blooming in Kealia Pond National Wildlife Refuge; Maui, Hawaii, United States of America — Stock Photo
    Sea Purslane (Sesuvium portulacastrum) blooming in Kealia Pond National Wildlife Refuge; Maui, Hawaii, United States of America
    Visible heart in female body silhouette, computer illustration. — Stock Photo
    Visible heart in female body silhouette, computer illustration.
    Man holding a heart, computer illustration. — Stock Photo
    Man holding a heart, computer illustration.
    Vascular system in male body, computer illustration. — Stock Photo
    Vascular system in male body, computer illustration.
    Illustration of healthy and fatty heart on white background. — Stock Photo
    Illustration of healthy and fatty heart on white background.
    Coronary blood vessels in blue human heart model, digital illustration. — Stock Photo
    Coronary blood vessels in blue human heart model, digital illustration.
    Heart anatomy in male thorax, computer illustration. — Stock Photo
    Heart anatomy in male thorax, computer illustration.
    Vascular network of human head — Stock Photo
    Vascular network of human head
    Arteries and veins of the hand — Stock Photo
    Arteries and veins of the hand
    Illustration of heart in transparent male silhouette. — Stock Photo
    Illustration of heart in transparent male silhouette.
    Female anatomy showing heart in transparent body silhouette, computer illustration. — Stock Photo
    Female anatomy showing heart in transparent body silhouette, computer illustration.
    Male upper body anatomy and blood vessels, computer illustration. — Stock Photo
    Male upper body anatomy and blood vessels, computer illustration.
    Female obese body with visible vascular system, digital illustration — Stock Photo
    Female obese body with visible vascular system, digital illustration
    Male head and neck anatomy, digital illustration. — Stock Photo
    Male head and neck anatomy, digital illustration.
    Chest, neck and head arteries — Stock Photo
    Chest, neck and head arteries
    Female vascular system structure,computer illustration. — Stock Photo
    Female vascular system structure,computer illustration.
    Digital illustration of senior man anatomy showing heart tumour. — Stock Photo
    Digital illustration of senior man anatomy showing heart tumour.
    Abstract male body with visible skeleton and lymphatic system, computer illustration. — Stock Photo
    Abstract male body with visible skeleton and lymphatic system, computer illustration.
    Female abdominal blood vessels, computer illustration. — Stock Photo
    Female abdominal blood vessels, computer illustration.
    Human heart model on blue background, computer illustration. — Stock Photo
    Human heart model on blue background, computer illustration.
    Digital anatomical illustration of arteries and veins in body of senior man. — Stock Photo
    Digital anatomical illustration of arteries and veins in body of senior man.
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    Section through an osteoid osteoma — Stock Photo
    Section through an osteoid osteoma
    Illustration of blood cells in injured artery. — Stock Photo
    Illustration of blood cells in injured artery.
    Female body showing skeleton and lymphatic system, digital illustration. — Stock Photo
    Female body showing skeleton and lymphatic system, digital illustration.
    Female anatomical body with visible lymphatic system, computer illustration. — Stock Photo
    Female anatomical body with visible lymphatic system, computer illustration.
    3d rendered illustration of colored female heart in body silhouette. — Stock Photo
    3d rendered illustration of colored female heart in body silhouette.
    Female body with visible vascular system, digital illustration. — Stock Photo
    Female body with visible vascular system, digital illustration.
    Healthy female vascular system, computer illustration — Stock Photo
    Healthy female vascular system, computer illustration
    Male back anatomy and skeletal system, computer illustration. — Stock Photo
    Male back anatomy and skeletal system, computer illustration.
    Vascular system of female upper body, computer illustration. — Stock Photo
    Vascular system of female upper body, computer illustration.
    Abstract female model with visible skeleton and lymphatic system, computer illustration. — Stock Photo
    Abstract female model with visible skeleton and lymphatic system, computer illustration.
    Cholesterol plaque leading to atherosclerosis — Stock Photo
    Cholesterol plaque leading to atherosclerosis
    Vascular system of human head, computer illustration. — Stock Photo
    Vascular system of human head, computer illustration.
    Colored scanning electron micrograph of red blood cells. — Stock Photo
    Colored scanning electron micrograph of red blood cells.
    Illustration of silhouette of obese man with visible heart. — Stock Photo
    Illustration of silhouette of obese man with visible heart.
    Male vascular system — Stock Photo
    Male vascular system
    Deflated and inflated stents and balloon catheters, digital illustration. — Stock Photo
    Deflated and inflated stents and balloon catheters, digital illustration.
    Realistic human heart model on black background, computer illustration. — Stock Photo
    Realistic human heart model on black background, computer illustration.
    Female anatomy showing heart in transparent body silhouette, computer illustration. — Stock Photo
    Female anatomy showing heart in transparent body silhouette, computer illustration.
    Male thorax with lymphatic system, computer illustration. — Stock Photo
    Male thorax with lymphatic system, computer illustration.
    Frontal illustration of blue silhouette of obese woman with highlighted heart on black background. — Stock Photo
    Frontal illustration of blue silhouette of obese woman with highlighted heart on black background.
    Veins in transparent dog body, anatomical computer illustration. — Stock Photo
    Veins in transparent dog body, anatomical computer illustration.
    Artery partially blocked by an atheroma — Stock Photo
    Artery partially blocked by an atheroma
    Transparent female body with visible lymphatic system, digital illustration. — Stock Photo
    Transparent female body with visible lymphatic system, digital illustration.
    3d illustration of blood knot in artery vessel. — Stock Photo
    3d illustration of blood knot in artery vessel.
    Male body with visible skeleton and vascular system, computer illustration. — Stock Photo
    Male body with visible skeleton and vascular system, computer illustration.
    Head anatomy, computer illustration — Stock Photo
    Head anatomy, computer illustration
    Head anatomy, computer illustration — Stock Photo
    Head anatomy, computer illustration