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    Conceptual illustration of red blood cells (erythrocytes) with oxygen molecules (white) in an artery. — Stock Photo
    Conceptual illustration of red blood cells (erythrocytes) with oxygen molecules (white) in an artery.
    Female doctor wearing mask anesthetizing mid adult man in hospital ward — Stock Photo
    Female doctor wearing mask anesthetizing mid adult man in hospital ward
    Activated T lymphocytes and red blood cells on scanning electron micrograph. — Stock Photo
    Activated T lymphocytes and red blood cells on scanning electron micrograph.
    Doctor and paramedics examining a patient in emergency room at hospital — Stock Photo
    Doctor and paramedics examining a patient in emergency room at hospital
    Scenic view of scuba diver swimming under water — Stock Photo
    Scenic view of scuba diver swimming under water
    Doctor examining pregnant woman during delivery in operating room — Stock Photo
    Doctor examining pregnant woman during delivery in operating room
    Surgeons adjusting oxygen mask on patient in operation theater of hospital — Stock Photo
    Surgeons adjusting oxygen mask on patient in operation theater of hospital
    Female doctor putting oxygen mask on patient face in the hospital — Stock Photo
    Female doctor putting oxygen mask on patient face in the hospital
    Female nurse inserting nasal cannula in senior woman. — Stock Photo
    Female nurse inserting nasal cannula in senior woman.
    Scenic view of female scuba diver swimming under water with fishes — Stock Photo
    Scenic view of female scuba diver swimming under water with fishes
    Close-up of patient with oxygen mask in operating room — Stock Photo
    Close-up of patient with oxygen mask in operating room
    Doctor with oximeter examining little patient — Stock Photo
    Doctor with oximeter examining little patient
    Intensive care unit equipped with monitor corrugated tubes for oxygen and different medical tools in veterinary clinic — Stock Photo
    Intensive care unit equipped with monitor corrugated tubes for oxygen and different medical tools in veterinary clinic
    Top view of crop unrecognizable doctor measuring blood oxygen of patient with heart rate monitor at table with stethoscope in clinic — Stock Photo
    Top view of crop unrecognizable doctor measuring blood oxygen of patient with heart rate monitor at table with stethoscope in clinic
    Crop unrecognizable woman using modern pulse oximeter on finger of kid for measuring oxygen level in blood — Stock Photo
    Crop unrecognizable woman using modern pulse oximeter on finger of kid for measuring oxygen level in blood
    Paramedics examining patient in ambulance — Stock Photo
    Paramedics examining patient in ambulance
    Paramedic giving oxygen to injured girl at accident spot — Stock Photo
    Paramedic giving oxygen to injured girl at accident spot
    Athlete riding an exercise bike — Stock Photo
    Athlete riding an exercise bike
    Sick boy in oxygen mask sitting on sofa at home and playing video game on tablet — Stock Photo
    Sick boy in oxygen mask sitting on sofa at home and playing video game on tablet
    High angle view of Caucasian man comforting pregnant woman during labor while mixed-race female doctor uses respirator on patient in operation theater at hospital — Stock Photo
    High angle view of Caucasian man comforting pregnant woman during labor while mixed-race female doctor uses respirator on patient in operation theater at hospital
    Scuba divers in Roatan Marine Park, West End Wall dive site; Roatan, Honduras — Stock Photo
    Scuba divers in Roatan Marine Park, West End Wall dive site; Roatan, Honduras
    Nurse consoling senior patient with doctor in hospital — Stock Photo
    Nurse consoling senior patient with doctor in hospital
    Doctor examining pregnant woman during delivery in operating room — Stock Photo
    Doctor examining pregnant woman during delivery in operating room
    Boy in oxygen mask using nebulizer during inhalation while sitting on sofa and reading book — Stock Photo
    Boy in oxygen mask using nebulizer during inhalation while sitting on sofa and reading book
    Doctors pushing emergency stretcher bed in corridor at hospital — Stock Photo
    Doctors pushing emergency stretcher bed in corridor at hospital
    Young boy sitting and inhaling through a oxygen mask at home. — Stock Photo
    Young boy sitting and inhaling through a oxygen mask at home.
    Pilot in mask operating airplane during flight — Stock Photo
    Pilot in mask operating airplane during flight
    High angle of crop mother using nebulizer for inhalation of boy sitting in oxygen mask on sofa — Stock Photo
    High angle of crop mother using nebulizer for inhalation of boy sitting in oxygen mask on sofa
    Paramedic giving oxygen to injured girl at accident spot — Stock Photo
    Paramedic giving oxygen to injured girl at accident spot
    Back view of anonymous sportspeople silhouettes with diving equipment and photo camera swimming under sea water with bubbles — Stock Photo
    Back view of anonymous sportspeople silhouettes with diving equipment and photo camera swimming under sea water with bubbles
    Doctor, nurse and paramedics examining patient on stretcher — Stock Photo
    Doctor, nurse and paramedics examining patient on stretcher
    Side view of little boy with asthma using inhaler while lying down on sofa at home — Stock Photo
    Side view of little boy with asthma using inhaler while lying down on sofa at home
    Doctor hand putting oxygen mask on patient in hospital — Stock Photo
    Doctor hand putting oxygen mask on patient in hospital
    Paramedic giving oxygen to injured girl at accident spot — Stock Photo
    Paramedic giving oxygen to injured girl at accident spot
    Side view unrecognizable person wearing silver costume with breathing apparatus and hose attached to potted plant standing in shabby abandoned room — Stock Photo
    Side view unrecognizable person wearing silver costume with breathing apparatus and hose attached to potted plant standing in shabby abandoned room
    Crop unrecognizable loving mother with infrared thermometer measuring temperature of boy breathing in oxygen mask during inhalation procedure and watching cartoon on tablet at home — Stock Photo
    Crop unrecognizable loving mother with infrared thermometer measuring temperature of boy breathing in oxygen mask during inhalation procedure and watching cartoon on tablet at home
    Group of surgeons performing operation in operation theater of hospital — Stock Photo
    Group of surgeons performing operation in operation theater of hospital
    Front view of beautiful thoughtful mixed race female patient lying on bed in the ward while looking outside in hospital. Pulse oximetry is measuring measuring the oxygen levels in her blood. — Stock Photo
    Front view of beautiful thoughtful mixed race female patient lying on bed in the ward while looking outside in hospital. Pulse oximetry is measuring measuring the oxygen levels in her blood.
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Boy in oxygen mask using nebulizer during inhalation while sitting on sofa and reading book — Stock Photo
    Boy in oxygen mask using nebulizer during inhalation while sitting on sofa and reading book
    Underwater view of diver wearing wetsuit, diving goggles and oxygen cylinder, air bubbles rising. — Stock Photo
    Underwater view of diver wearing wetsuit, diving goggles and oxygen cylinder, air bubbles rising.
    Snake red blood cells. Coloured scanning electron micrograph (SEM) of whole and fractured red blood cells (erythrocytes, red) in a small blood vessel of a snake — Stock Photo
    Snake red blood cells. Coloured scanning electron micrograph (SEM) of whole and fractured red blood cells (erythrocytes, red) in a small blood vessel of a snake
    Team of doctors putting oxygen mask on patient face in the hospital — Stock Photo
    Team of doctors putting oxygen mask on patient face in the hospital
    Measuring oxygen saturation in blood with pulse oximeter. — Stock Photo
    Measuring oxygen saturation in blood with pulse oximeter.
    Young woman with resuscitation mask and male hand. — Stock Photo
    Young woman with resuscitation mask and male hand.
    Overview of diverse doctors interacting with patients in the ward at hospital — Stock Photo
    Overview of diverse doctors interacting with patients in the ward at hospital
    Doctors pushing emergency stretcher bed in corridor at hospital — Stock Photo
    Doctors pushing emergency stretcher bed in corridor at hospital
    Senior woman with nasal cannula and IV bag and nurse holding tray in background. — Stock Photo
    Senior woman with nasal cannula and IV bag and nurse holding tray in background.
    Close-up of senior patient wearing oxygen mask lying on hospital bed — Stock Photo
    Close-up of senior patient wearing oxygen mask lying on hospital bed
    Cancer cells with blood vessel formation — Stock Photo
    Cancer cells with blood vessel formation
    Group of surgeons performing operation in operation room at hospital — Stock Photo
    Group of surgeons performing operation in operation room at hospital
    Senior patient with oxygen mask in hospital — Stock Photo
    Senior patient with oxygen mask in hospital
    Female nurse holding oxygen mask over male patient's mouth in intensive care unit — Stock Photo
    Female nurse holding oxygen mask over male patient's mouth in intensive care unit
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Doctors examining patient in corridor at hospital — Stock Photo
    Doctors examining patient in corridor at hospital
    Surgeon holding oxygen mask in operation room at hospital — Stock Photo
    Surgeon holding oxygen mask in operation room at hospital
    Content mother putting on oxygen mask on face of son for inhalation procedure while sitting on sofa at home — Stock Photo
    Content mother putting on oxygen mask on face of son for inhalation procedure while sitting on sofa at home
    Doctors adjusting oxygen mask while rushing the patient in emergency room at hospital — Stock Photo
    Doctors adjusting oxygen mask while rushing the patient in emergency room at hospital
    Cheerful child breathing in oxygen mask during inhalation and playing with soft toy on couch at home — Stock Photo
    Cheerful child breathing in oxygen mask during inhalation and playing with soft toy on couch at home
    Group of surgeons performing operation in operation theater of hospital — Stock Photo
    Group of surgeons performing operation in operation theater of hospital