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Biceps and triceps muscles at work, 3D animation. 1970-01-01T00:00:00+00:00Synergistic action of biceps brachii and brachialis, antagonistic action of triceps brachii in elbow flexion, unlabeled. PT21Shttps://d38zjy0x98992m.cloudfront.net/e3282157-9894-4edb-8546-8fb9bf5791f8/biceps_triceps_xlarge.jpghttps://d38zjy0x98992m.cloudfront.net/e3282157-9894-4edb-8546-8fb9bf5791f8/biceps_triceps_mp4_hd_video.mp4