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The sternocleidomastoid muscle inserts on the occipital bone.

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The inferior constrictor, middle constrictor, and superior constrictor are muscles that move the wall of the pharynx, assisting with the movement of food and liquid into the esophagus.

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Which of the following is/are TRUE? 1) Synergists are muscles that oppose the agonist. 2) Agonists contract while the antagonists relax. 3) The biceps brachii and the triceps brachii are an antagonistic pair.


A) 1, 2, 3
B) 2, 3 only
C) 1, 2 only
D) 2 only

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The principal muscle used for extending the thigh, as in climbing stairs, is the _____.

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gluteus ma...

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Two muscles that insert on the angle and ramus of the mandible, and that elevate the mandible are: 1) masseter 2) medial pterygoid 3) lateral pterygoid 4) temporalis


A) 1, 2
B) 2, 3
C) 3, 4
D) 1, 4

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The muscle indicated by line A is the The muscle indicated by line A is the   A)  Psoas major B)  Gracilis C)  Obturator externus D)  Iliacus


A) Psoas major
B) Gracilis
C) Obturator externus
D) Iliacus

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To produce movement, a bone acts as a lever and the joint acts as the _____.

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The extrinsic muscles of the eyeball are innervated by:


A) oculomotor (III) nerves.
B) abducens (VI) nerves.
C) trochlear (IV) nerves.
D) all of these choices.

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The muscle indicated by line B originates from the _____ and inserts on the _____.


A) ilium, femur
B) ilium, tibia
C) ischium, femur
D) ischium, tibia

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The psoas major and iliacus muscles have a common insertion on the femur. These two muscles are involved in _____ of the thigh.


A) flexion
B) extension
C) adduction
D) abduction

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Which of the following statements regarding the quadriceps femoris is correct?


A) Rectus femoris originates from the anterior inferior iliac spine.
B) Vastus lateralis inserts on the lateral condyle of the tibia.
C) All four muscles flex the thigh.
D) Vastus medialis originates from the lesser trochanter.

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A

What muscle is indicated by line B? What muscle is indicated by line B?

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The range of movement at a joint depends upon the point of attachment of the muscle and the length of its fibers.

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The pectoralis minor muscle


A) inserts on the greater tubercle of the humerus.
B) inserts on the acromion of the scapula.
C) may originate from ribs 3 to 5.
D) originates from the clavicle and sternum.

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What muscle is indicated by line A? What muscle is indicated by line A?

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Soleus
Que...

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What is the action of the plantar interossei?


A) extend leg
B) adduct toes
C) dorsiflex foot
D) abduct toes
E) flex toes

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The _____ muscle is a landmark that separates the anterior and posterior triangles of the neck.

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What muscle is indicated by line D? What muscle is indicated by line D?

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Semimembranosus

The ischiocavernosus muscles maintain erection of the penis in the male and the clitoris in the female.

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Using the terms prime mover, antagonist, synergist, and fixator, describe the various roles muscles may play in a group.

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Within opposing muscle pairs, one muscle, called the prime mover, contracts to cause an action while the other muscle, the antagonist, stretches and yields to the effects of the prime mover. For example, flexing the forearm at the elbow involves the biceps brachii as the prime mover and the triceps brachii as the antagonist. Synergists prevent unwanted movements at intermediate joints or otherwise aid the movement of the prime mover. For example, contraction of the wrist extensor muscles stabilizes the wrist joint and prevents unwanted movement, while the flexor muscles of the fingers contract to flex the fingers. Fixators stabilize the origin of the prime mover so the prime mover can act more efficiently. For example, in abduction of the arm, the deltoid muscle serves as the prime mover, and fixators include pectoralis minor, trapezius, subclavius, serratus anterior muscles, and others which hold the scapula in place.

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