Muscle Recruitment Mechanisms in Exercise Physiology

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What is the main function of autonomic nerves in relation to involuntary muscles?

Produce both excitatory and inhibitory effects

Which region of the brainstem is responsible for the 'fight or flight' aspect of the autonomic nervous system?

Medulla

In motor unit anatomy, how many muscle fibers generally receive input from one motor neuron?

Only 1

What does a motor neuron pool consist of?

<p>All the motor neurons that innervate one muscle</p> Signup and view all the answers

Which step occurs first in the excitation process at the neuromuscular junction (NMJ)?

<p>ACh releases from vesicles in axons</p> Signup and view all the answers

How does the number of muscle fibers per motor neuron relate to a muscle's specific movement function?

<p>More fibers result in finer control</p> Signup and view all the answers

What is one way to increase muscle force production through neuromuscular communication?

<p>Increase the number of motor units recruited</p> Signup and view all the answers

How does repetitive stimuli affect muscle tension?

<p>It increases total tension by preventing muscle relaxation</p> Signup and view all the answers

Which factor affects the nerve's conduction velocity and, in turn, influences motor unit discharge frequency?

<p>Muscle size</p> Signup and view all the answers

What major factor distinguishes skilled from unskilled muscle performance according to the Size Principle of Motor Unit Recruitment?

<p>Control of motor unit firing patterns</p> Signup and view all the answers

What is one characteristic that can lead to selective recruitment of type II motor units in muscle actions?

<p>Change in direction of exerted forces</p> Signup and view all the answers

What is one component that impacts voluntary muscle action during fatigue?

<p>Decrease in force capacity with repeated stimulation</p> Signup and view all the answers

What is the main purpose of endplate potentials spreading from motor endplate to extra-junctional sarcolemma of muscle?

<p>To spread to inner structures of the muscle fiber to prime the contractile machinery for excitation</p> Signup and view all the answers

How are motor units classified based on the muscle fibers they innervate?

<p>By a combination of physiologic and mechanical properties</p> Signup and view all the answers

What influences the muscle fiber type in a motor unit?

<p>The designation of the motor unit</p> Signup and view all the answers

According to the All-or-None Principle of Tension Generation, what happens when a stimulus triggers a motor neuron action potential?

<p>All muscle fibers in the motor unit contract synchronously</p> Signup and view all the answers

How does the force of muscle action vary according to the text?

<p><code>It varies from slight to max</code></p> Signup and view all the answers

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