What does the term "motor unit recruitment " mean ? How did we demonstrate motor unit recruitment in this exercise ? Additionally , you should review the concept check questions (# 20 -21 ) in the textbook (81h edition , p . 395 ,- 7th edition , p . 398 ). As you already know . neurons and muscle fibers both produce electrlcal impulses (action potentials ). But in the introduction of this lab exercise , you were told that the electromyogram cannot distinguish between electricity generated by muscle or nerve tissue ' Why can we conclude that almost 100 % of the electricity measured by an EMG is coming from the contracting muscles . since the motor neurons must also be ring action potentials for the muscles to contract 7 Describe the order of motor unit recruitment in terms of types of skeletal muscle fibers ( slow Mitch fast twitch and intermediate ), as force of contraction increases from 5kg to 30 kg , How does the nervous system control this order ? (p. 395 , B 'l' e d itio n ; p. 3 9 8 , 7 \"' edition ). How do we avoid fatigue in a skeletal muscle when attempting to sustain a contraction 7 Review table 12.2 in your textbook (8 'l' & 7'h editions ) and explain the following ' Why are the white - fast - Mitch muscle fibers capable of creating stronger contractions than the other two types of skeletal muscle fibers ? ' Why do the white -fast -twltch muscle fibers fatigue faster than the other two types of skeletal muscle fibers ? ' While every skeletal muscle of every person contains all three types of skeletal muscle bers . genetics play a role in the % distribution Given the following hypothetical example shown in the table below of two men of same age , neither of whom exercises regularly : which test subject would potentially make a better long - distance swimmer ? Justify your