The force of a movement is most directly controlled by
A)the rate of motor neuron firing alone.
B)recruitment of motor units alone.
C)feedback from muscle spindles and recruitment.
D)the rate of motor neuron firing and recruitment.

Question

The force of a movement is most directly controlled by 
A)the rate of motor neuron firing alone. 
B)recruitment of motor units alone. 
C)feedback from muscle spindles and recruitment. 
D)the rate of motor neuron firing and recruitment.

Quizplus · Accepted Answer

The force of a movement is most directly controlled by the rate of motor neuron firing and recruitment working together. The rate of motor neuron firing determines the frequency of muscle contractions, while recruitment dictates how many motor units are activated to contribute to the force of the movement. Both factors must be considered to achieve the desired level of force. Feedback from muscle spindles may play a role in fine-tuning the movement and ensuring it stays consistent with the intended force, but it is not the primary factor controlling force.

The Force of a Movement Is Most Directly Controlled by