animation depicting a zoom into alveoli both with and without capillaries. the focus of this image is on alveoli without capillaries with some of the alveolar sacs cross-sectioned. - terminal bronchiole stock videos & royalty-free footage00:08Animation depicting a zoom into alveoli both with and without capillaries. The focus of this image is on alveoli without capillaries with some of the alveolar sacs cross-sectioned.