esponse ustle Cells being stimulated increase muscle response C. Decrease # musc

Question

esponse ustle Cells being stimulated increase muscle response C. Decrease # muscle cells-being stimulated increase muscle response D. Decrease # muscle cells-being stimulated decrease muscle response E. Decrease frequency of muscle stimulation Decrease muscle response 20 - One of the events does not correspond to the contraction of the sarcomere A. Thin filaments slide past thick ones so they overlap more B. The X disc Shorten C. The H zones Disappears D. Te contiguous A bands closer together. E. The X disc stretch 21. - Choose which the best description of Sternocleidomastoid Muscle is It originates in Manubrium of sternum and medial portion of clavicle and inserts in the Mastoid process of temporal bone and superior nuchal line of occipital bone. It Flexes and laterally rotates the head. This muscle encircles mouth and inserts into muscle and skin at angle of mouth, it closes lips; purses and protrudes lips, kissing and whistling A. B. C. It is Large, fan-shaped, covering superior portion of chest, anterior axilla fold. It adducts and medially rotates D. It is a strong muscle that is immediately deep biceps brachii on distal humerus. It is a major forearm flexor arm E. It originate in superior tibia and fibula and interosseous membrane and its tendon passes behind medial malleolus and under arch of foot, inserts into several tarsals and metatarsals II-IV. It is a prime mover of foot inversion -Choose which the best description of Pectoralis Major Muscle is A It originates in Manubrium of sternum and medial portion of clavicle and inserts in the Mastoid process of temporal bone and superior nuchal line of occipital bone. It Flexes and laterally rotates the head B. This muscle encirn

Explanation / Answer

Answer for 21 is

A. It originates in Manubrium of sternum and medial portion of clavicle and inserts in the mastoid process of temporal bone and superior nuchal line of occipital bone. It flexes and laterally rotates the head.

This muscle is present in the neck and is also known as sternomastoid.

It is a paired muscle located in superficial layers of the side of the neck. It is found to be among the most superficial and largest cervical muscles. The main function is to rotate the head to the opposite side and flexion of the neck.

This name is given as it orginates at the manubrium of the sternum as sterno and the clavicle as cleido and also because of its insertion at the mastoid process of the temporal bone of the skull it is given mastoid. Hence the name sternocleidomastoid.

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