A motor unit containing how many muscle fibers would enable the most precise neuromuscular control?

The most precise neuromuscular control is typically associated with a lower number of muscle fibers per motor unit. When a motor unit consists of around 10 muscle fibers, it allows for finer control over muscle contractions. This is especially important in muscles that require delicate or precise movements, such as those involved in writing or playing musical instruments.

A smaller motor unit with fewer muscle fibers provides more specific and refined control because it enables individual muscle fibers to respond more distinctly to motor neuron signals. This precision also reduces the likelihood of accidentally activating a larger group of fibers simultaneously, thereby enhancing the ability to perform intricate tasks.

In contrast, motor units with higher numbers of muscle fibers can produce more forceful contractions but lack this degree of precision, making them more suitable for gross motor movements, such as those required in larger muscle groups during heavy lifting or running.

Thus, the option indicating 10 muscle fibers in a motor unit strikes a balance between sufficient force production and the necessary precision required for fine motor skills.