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diagram font line text circle brand organ presentation cartoon drawing logo eye advertising document nose map face screenshot capillaries alveoli gas exchange human body capillary alveolus bronchial alveolar dioxide arteriole air cell flow circulatory vascular cavity biology circulation anatomical vein vessel hemoglobin vessels duct red science healthy system medicine pulmonary health oxygen respiratory respiration anatomy medical blood bronchi breath artery lungs lung structure breathe called blood-air barrier alveoli body