As Jim lifts his arms upward, Sally suddenly grabs them and pushes them down. When Jim's arms meet this resistance:
a. the intrafusal muscle fibers shorten more than the extrafusal muscle fibers.
b. the contraction is lessened.
c. the extrafusal muscle fibers shorten more than the extrafusal muscle fibers.
d. the monosynaptic stretch reflex is inhibited.
Answer: A
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