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Chapter 10

Chapter 10 - 1 A pair of tweezers is a good example of a...

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1) A pair of tweezers is a good example of a second-class lever. FALSE 2) Both first- and second-class levers operate at a mechanical disadvantage. FALSE 3) Although all skeletal muscles have different shapes, the fascicle arrangement of each muscle is exactly the same. FALSE 4) Muscles are only able to pull, they never push. TRUE 5) The anconeus muscle flexes the knee and stabilizes the patella. FALSE 6) Movements of the thigh are accomplished by muscles anchored to the pelvic girdle. TRUE 7) The insertion of the biceps brachii is on the radius. TRUE 8) The chewing muscle covering the ramus of the mandible is the buccinator. FALSE 9) A prime mover of the arm that acts in adduction would be the deltoid. FALSE 10) The soleus is a synergist of the gastrocnemius used in plantar flexion. TRUE 11) Muscles that help to maintain posture are often called synergists. FALSE 12) In order to propel food down to the esophagus, the pharyngeal constrictor muscles would be used. TRUE 13) Plantar flexion at the ankle joint is accomplished by the tibialis anterior muscle. FALSE 14) The arrangement of a muscle ʹ s fascicles determines its range of motion and power. TRUE 15) Muscle power does not depend on the direction of the fascicles. TRUE 16) The calcaneal tendon (Achilles tendon) is the largest, strongest tendon in the body. TRUE 17) The epicranius or occipitofrontalis has two bellies, the frontal and occipital. TRUE 18) Electromyography is the recording and interpretation of graphic records of the electrical activity of contracting muscles. TRUE 19) Severing of the patellar tendon would inactivate the hamstring group. FALSE 20) The broadest muscle of the back is the latissimus dorsi. TRUE 21) Muscle spasms of the back would often include the erector spinae. TRUE 22) Muscles connecting to the hyoid bone are instrumental in speech. FALSE 1)Scissors demonstrate which type of lever? A)a first-class lever B)a second-class lever C)a third-class lever D)a fourth-class lever 2) What muscle is responsible for keeping your toes from dragging when walking? A)extensor digitorum B)tibialis anterior C)extensor hallicus longus D)fibularis tertius 3)What is the major factor controlling the manner in which levers work? A) the structural characteristics of the muscles of the person using the lever B)the weight of the load C)the direction the load is being moved D)the difference in the positioning of the effort, load, and fulcrum 4) With regard to muscle fiber arrangement in a pennate muscle ________. A)the fascicles are short and attach obliquely to a central tendon that runs the length of a muscle
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B)the fascicular pattern is circular C)the fascicles form a triangle D)the fascicles are in a fusiform arrangement 5) What primarily determines the power of a muscle? A)the length
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Chapter 10 - 1 A pair of tweezers is a good example of a...

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