Recordings of Extrafusal Muscle Tension and Accompanying Sensory Discharge from Muscle

question 53

Multiple Choice

Recordings of extrafusal muscle tension and accompanying sensory discharge from muscle spindles reveal that

• A) stimulation of α motoneurons is required to elicit a response from fusiform γ efferents.
• B) fusiform efferents respond when extrafusal muscle fibers are relaxed.
• C) fusiform efferents respond only if extrafusal muscle fibers are stimulated.
• D) intrafusal muscle fibers' work load is proportional to that of the extrafusal muscle fibers.
• E) intrafusal muscle fibers exhibit either maximum tension or none at all, depending on the tension experienced by the extrafusal muscle fibers.

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