The biceps brachii muscle inserts at ______; its main action is _____ and _____.   A. distal phalanges of fingers; extension of fingers   B. olecranon of ulna; extension of forearm   C. radial tuberosity; flexion of elbow and supination of forearm   D. palmar aponeurosis; tenses skin of palm The orbicularis oris muscle has origins at _____ and _____; its main action is to _____.   A. occipital and temporal bones; raise eyebrows   B. frontal and maxillary bones; close eyes   C. zygomatic and maxillary bone; smile   D. maxilla and mandible; close lips

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