Muscle fibers generally only have one motor end plate, but motor neurons innervate many different muscle fibers in a group. Choose the statement that correctly explains how this affects muscle contraction.
A. The force of a contraction does not at all depend on the strength of the signal sent via the motor neuron.
B. While muscle fibers only have one motor end plate, they can recruit each other to contract once a fiber receives a signal.
C. When a motor neuron transmits a signal, only one fiber will contract with strong force.
D. A signal traveling through one motor neuron can potentially make multiple fibers in a group contract, generating more force.
Answer: D
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