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Respiratory system with gas exchange, animation. 1970-01-01T00:00:00+00:00Respiratory system anatomy showing upper and lower respiratory tract, bronchial tree and alveoli, with gas exchange process inside an alveolus, unlabeled. PT64Shttps://d3e1m60ptf1oym.cloudfront.net/55bcf04d-9e18-403b-881b-3c5148b75443/respiratory_system_xlarge.jpghttps://d3e1m60ptf1oym.cloudfront.net/55bcf04d-9e18-403b-881b-3c5148b75443/respiratory_system_mp4_hd_video.mp4