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12497912 - Male Chest Revealing Heart and Lungs
12271691 - Erythrocytes releasing oxygen, animation
11939768 - Capillary blood flow, light microscopy
12365334 - Prickly pear cactus Opuntia spp stomata, SEM
11945563 - Plant stoma, SEM
11945337 - Mosquito larva siphon
11945322 - Anal gills of a mosquito larva
12329509 - Leaf stomata, SEM
12081703 - Blood flow in tadpole gills
11945584 - Plant stoma, SEM
12497920 - Air Leaving Lungs
12497891 - Bronchial Hyperreactivity
12497918 - Male Torso Revealing Lungs
11945571 - Plant stoma, SEM
11936438 - CO2 transport in the blood, animation
11945317 - Mosquito larva siphon
12497945 - Effects of Asthma on Bronchioles
12329522 - Differentiating flower meristem, SEM
11945344 - Mosquito larva siphon
12271883 - Leaf stoma, light microscopy
11936707 - Opening and closing stoma, animation
11934906 - Tomato SEM
12497903 - Asthma Symptoms, Bronchiole
12081705 - Blood flow in tadpole gills
12365331 - Broccoli differentiating apical meristem, SEM
11945323 - Mosquito larva siphon
11934902 - Tomato SEM
11945327 - Mosquito larva siphon
11936950 - Circulation in larval newt gills
11945339 - Mosquito larva siphons
12081704 - Blood flow in tadpole gills
11936948 - Circulation in larval newt gills
11934910 - Tomato stem surface, SEM
11934905 - Tomato SEM
11934907 - Tomato SEM
11934909 - Tomato SEM
11936949 - Circulation in larval newt gills
11934908 - Tomato stoma and stem surface, SEM
13228031 - Lung bronchioles and alveoli, animation
11934903 - Tomato SEM
12081650 - Haemoglobin molecule, animation
12364423 - Alveoli
11934904 - Tomato SEM
11938273 - Gas exchange in an alveolus
11934432 - Gas exchange in an alveolus
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