What occurs when gamma motor neurons to a muscle are activated?
A)The muscle spindle goes slack.
B)The contractile ends of intrafusal fibers elongate.
C)The muscle lengthens.
D)Extrafusal muscle fibers within that muscle are inhibited from contracting.
E)Action potential firing increases in afferent neurons from the muscle spindles.

Question

Quizplus · Accepted Answer

When gamma motor neurons are activated, they cause the contractile ends of intrafusal fibers to contract, maintaining tension in the muscle spindle. This increases the sensitivity of the spindle to stretch, leading to an increase in action potential firing in afferent neurons from the muscle spindles.

What Occurs When Gamma Motor Neurons to a Muscle Are