If You Voluntarily Lift an Object and Have Underestimated Its

question 43

Multiple Choice

If you voluntarily lift an object and have underestimated its weight,

• A) the intrafusal muscle fibers shorten at a rate that maintains constant tension on the stretch receptor.
• B) the muscle spindle afferents fire a rapid burst of action potentials.
• C) α motor neurons fire action potentials but γ motor neurons do not.
• D) γ motor neurons fire action potentials but α motor neurons do not.

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