Question

question 7 (mandatory) (0.5 points) the orbicularis oris muscle has origins at ____ and __; its main action is to __. a) occipital and temporal bones; raise eyebrows b) zygomatic and maxillary bone; smile c) frontal and maxillary bones; close eyes d) maxilla and mandible; close lips question 8 (mandatory) (0.5 points) the sternocleidomastoid muscle inserts at __ and __; its main action is to ____. a) clavicle and scapula; abduction of arm b) zygomatic and maxilla; close jaw c) clavicle and sternum; flexion of arm and rotate arm d) temporal and occipital bone; flexion of neck forward and rotate head

Explanation:

The orbicularis oris muscle originates at the occipital and temporal bones and raises eyebrows. The sternocleidomastoid muscle inserts at the clavicle and sternum and its main actions include flexion of the arm and rotation of the arm. These are based on anatomical knowledge of muscle - bone attachments and muscle functions.

Answer:

Question 7:
A. occipital and temporal bones; raise eyebrows
Question 8:
C. clavicle and sternum; flexion of arm and rotate arm