After stretching an intrafusal fiber, the next event is
A) an increase in action potentials along the associated sensory neuron.
B) a decrease in muscle tension.
C) a decrease in muscle tone.
D) decreased sensitivity to stretching.
E) All of the answers are correct.

Question

Quizplus · Accepted Answer

After stretching an intrafusal fiber, there will be an increased firing of action potentials along the associated sensory neuron, leading to a reflexive contraction of the extrafusal fibers and an increase in muscle tension. This is the basis of the stretch reflex, which helps to maintain muscle tone and joint stability. The other answer choices are not accurate in describing the immediate effects of intrafusal fiber stretching.

After Stretching an Intrafusal Fiber, the Next Event Is