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The fibers that carry the action potentials that cause skeletal muscle to contract are __________.


A) gamma motor neurons
B) anulospiral endings
C) intrafusal fibers
D) extrafusal fibers
E) alpha motor neurons

F) None of the above
G) A) and D)

Correct Answer

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Posterior root ganglia contain somas of unipolar neurons.

A) True
B) False

Correct Answer

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Which of the following groups of muscles has the most muscle spindles?


A) Muscles of the hand
B) Muscles of the back
C) Muscles of the thigh
D) Muscles of the middle-ear
E) Muscles of the torso

F) B) and D)
G) A) and D)

Correct Answer

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The crossed extension reflex is the contraction of the extensors on one side of the body when the flexors are contracted on the other side.

A) True
B) False

Correct Answer

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