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    Crenated red blood cells — Stock Photo
    Crenated red blood cells
    Red blood cells flowing inside an artery — Stock Photo
    Red blood cells flowing inside an artery
    Red blood cells aggregated — Stock Photo
    Red blood cells aggregated
    Blood oxygen monitor on finger of patient in intensive care ward, close-up. — Stock Photo
    Blood oxygen monitor on finger of patient in intensive care ward, close-up.
    Cancer cells with blood vessel formation — Stock Photo
    Cancer cells with blood vessel formation
    Blue sky with clouds, snowy mountains and forest behind the road. Road through Yosemite National Park, America, USA — Stock Photo
    Blue sky with clouds, snowy mountains and forest behind the road. Road through Yosemite National Park, America, USA
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Scuba diver underwater under sun beams — Stock Photo
    Scuba diver underwater under sun beams
    Surgeons performing surgery in operating room — Stock Photo
    Surgeons performing surgery 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
    Back view of anonymous sportsman with diving equipment exploring sea with swimming fish and mountains — Stock Photo
    Back view of anonymous sportsman with diving equipment exploring sea with swimming fish and mountains
    Cancer cells with blood vessel formation — Stock Photo
    Cancer cells with blood vessel formation
    Scenic view of scuba divers swimming under water — Stock Photo
    Scenic view of scuba divers swimming under water
    Close-up of iv drip bottle next to the patients bed in hospital room — Stock Photo
    Close-up of iv drip bottle next to the patients bed in hospital room
    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
    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
    Nurse putting oxygen mask on patient in hospital — Stock Photo
    Nurse putting oxygen mask on patient in hospital
    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.
    Close-up of oxygen cylinder in workshop — Stock Photo
    Close-up of oxygen cylinder in workshop
    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
    High angle view of thoughtful mixed-race female patient relaxing in bed in the ward at hospital — Stock Photo
    High angle view of thoughtful mixed-race female patient relaxing in bed in the ward at hospital
    Portrait of mature mixed-race female patient sleeping in bed in the ward at hospital — Stock Photo
    Portrait of mature mixed-race female patient sleeping in bed in the ward at hospital
    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
    Two doctors preparing elderly patient before medical procedure — Stock Photo
    Two doctors preparing elderly patient before medical procedure
    Female doctor putting oxygen mask on patient face in the hospital — Stock Photo
    Female doctor putting oxygen mask on patient face in the hospital
    Activated T lymphocytes and red blood cells on scanning electron micrograph. — Stock Photo
    Activated T lymphocytes and red blood cells on scanning electron micrograph.
    Side view of little boy with asthma using inhaler while sitting on sofa at home — Stock Photo
    Side view of little boy with asthma using inhaler while sitting on sofa at home
    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
    Side view unrecognizable person in silver costume with breathing apparatus and hose attached to potted plant sitting on chair in weathered abandoned house room — Stock Photo
    Side view unrecognizable person in silver costume with breathing apparatus and hose attached to potted plant sitting on chair in weathered abandoned house room
    Group of surgeons performing operation in operation theater of hospital — Stock Photo
    Group of surgeons performing operation in operation theater of hospital
    Side view of content sick boy using respirator and breathing oxygen from inhaler while sitting on sofa at home — Stock Photo
    Side view of content sick boy using respirator and breathing oxygen from inhaler while sitting on sofa at home
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Portrait of Caucasian male patient relaxing in bed in the ward at hospital — Stock Photo
    Portrait of Caucasian male patient relaxing in bed in the ward at hospital
    Front view of thoughtful mixed-race female patient lying in bed while pulse oximetry measures oxygen saturation in the blood in ward at hospital. — Stock Photo
    Front view of thoughtful mixed-race female patient lying in bed while pulse oximetry measures oxygen saturation in the blood in ward at hospital.
    Red blood cells and white blood cells — Stock Photo
    Red blood cells and white blood cells
    Group of surgeons performing operation in operation theater of hospital — Stock Photo
    Group of surgeons performing operation in operation theater of hospital
    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
    Doctor comforting pregnant woman during labor at hospital — Stock Photo
    Doctor comforting pregnant woman during labor at hospital
    Cardiovascular system transporting nutrients and oxygen — Stock Photo
    Cardiovascular system transporting nutrients and oxygen
    Close-up of patient with oxygen mask in operating room — Stock Photo
    Close-up of patient with oxygen mask in operating room
    Close up of rapids in a mountain river with long exposure effect — Stock Photo
    Close up of rapids in a mountain river with long exposure effect
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Measuring oxygen levels in blood with pulse oximeter. — Stock Photo
    Measuring oxygen levels in blood with pulse oximeter.
    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
    Front view of diverse male patients interacting with each other in the ward at hospital. — Stock Photo
    Front view of diverse male patients interacting with each other in the ward at hospital.
    Senior patient lying on bed with oxygen mask on face in hospital — Stock Photo
    Senior patient lying on bed with oxygen mask on face in hospital
    Ward boy pushing senior patient on stretcher in hospital corridor — Stock Photo
    Ward boy pushing senior patient on stretcher in hospital corridor
    Female patient with nasal cannula, portrait. — Stock Photo
    Female patient with nasal cannula, portrait.
    Nurse consoling senior patient with doctor in hospital — Stock Photo
    Nurse consoling senior patient with doctor in hospital
    Paramedic giving oxygen to injured girl at accident spot — Stock Photo
    Paramedic giving oxygen to injured girl at accident spot
    Doctor, nurse and paramedics examining patient on stretcher — Stock Photo
    Doctor, nurse and paramedics examining patient on stretcher
    3d illustration of red blood cells erythrocytes. — Stock Photo
    3d illustration of red blood cells erythrocytes.
    Nurse consoling senior patient with doctor in hospital — Stock Photo
    Nurse consoling senior patient with doctor in hospital
    Blood oxygen monitor on finger of patient in intensive care ward, close-up. — Stock Photo
    Blood oxygen monitor on finger of patient in intensive care ward, close-up.
    From above of crop medical specialist using pulse oximeter sensor while examining kid in hospital — Stock Photo
    From above of crop medical specialist using pulse oximeter sensor while examining kid in hospital
    Anesthesiologist holding oxygen mask over patient?s face in operating room — Stock Photo
    Anesthesiologist holding oxygen mask over patient?s face in operating room
    Measuring oxygen levels in blood with pulse oximeter. — Stock Photo
    Measuring oxygen levels in blood with pulse oximeter.
    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
    Anesthesiologist holding oxygen mask over patient during surgery — Stock Photo
    Anesthesiologist holding oxygen mask over patient during surgery