The dynamic response of the muscle spindle receptor can best be described as which of the following?
A)An increase in the activity of the nuclear chain fibers as a result of the change in length of the muscle fiber
B)An increase on activity of the group II sensory afferents in response to the rate of change in length of the muscle fiber
C)A decrease in the activity of the group 1a sensory afferents in response to a change in length of the muscle fiber
D)An increase in the activity of the muscle spindle receptor that is proportional to the rate of change in length of the muscle fiber

Question

Quizplus · Accepted Answer

The dynamic response of the muscle spindle receptor is best described as an increase in activity that is proportional to the rate of change in length of the muscle fiber. This means that as the muscle fiber changes length more quickly, the activity of the muscle spindle receptor increases in response. This is detected by group Ia sensory afferents. Therefore, choice D is the best description of the dynamic response of the muscle spindle receptor.

The Dynamic Response of the Muscle Spindle Receptor Can Best