Which is TRUE about reflexes initiated by muscle spindle activation?
A)They have a monosynaptic component.
B)They result in activation of gamma motor neurons.
C)They result in activation of extrafusal muscle fibers.
D)The "knee-jerk" reflex is an example.
E)They inhibit the activation of muscles that are stretched.

Question

Quizplus · Accepted Answer

Reflexes initiated by muscle spindle activation are monosynaptic and result in the activation of extrafusal muscle fibers. The "knee-jerk" reflex is an example of this type of reflex. Gamma motor neurons are not directly involved in these reflexes. Additionally, they do not inhibit the activation of muscles that are stretched; rather, they cause a contraction in response to stretching.

Which Is TRUE About Reflexes Initiated by Muscle Spindle Activation