Question

when muscle fibers receive a message from a motor neuron, but dont move yet, this is called _____________. latent period period of contraction antagonist period relaxation period rewatch submit

Explanation:

To solve this, we analyze each option:

• "latent period": The time between a motor neuron's message and muscle movement starting. This matches the description.
• "period of contraction": When the muscle is actively shortening, so not when it hasn't moved yet.
• "antagonist period": Not a standard term for muscle response phases.
• "relaxation period": When the muscle is returning to rest, after contraction.

Answer:

A. latent period