Question

multiple choice 0.7 points the all - or - none principle states that when a motor neuron reaches threshold, all muscle fibers innervated by that neuron will fire maximally when a motor neuron reaches threshold, all muscle fibers in that muscle will be activated when a motor neuron reaches threshold, all muscle fibers innervated by that neuron will fire, but not necessarily maxima

Explanation:

The all - or - none principle in muscle physiology states that when a motor neuron reaches its threshold potential, all the muscle fibers it innervates will fire maximally. It's an all - or - nothing response; either the muscle fibers fire at their full capacity or they don't fire at all. The key is that it's about the muscle fibers innervated by a single motor neuron, not all fibers in a whole muscle.

Answer:

When a motor neuron reaches threshold, all muscle fibers innervated by that neuron will fire maximally