1. What does the term “motor unit recruitment” mean?
2. Describe the order of motor unit recruitment in terms of types of skeletal muscle fibers (slow twitch, fast twitch and intermediate), as force of contraction increases from 5kg to 30 kg. How does the nervous system control this order?
3. Explain the following: (1)
a. Why are the white-fast-twitch muscle fibers capable of creating stronger contractions than the other two types of skeletal muscle fibers?
b. Why do the white-fast-twitch muscle fibers fatigue faster than the other two types of skeletal muscle fibers?
c. While every skeletal muscle of every person contains all three types of skeletal muscle fibers, 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 answer. (The table is the jpg in embedded in the question)