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HMS, BM EQ-Bank 92 MC

Which best describes how motor units are recruited during a bicep curl exercise?

  1. Large motor units are recruited before small motor units
  2. All motor units are recruited simultaneously
  3. Motor units are recruited randomly
  4. Small motor units are recruited before large motor units
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\(D\)

Show Worked Solution

Consider Option D: Small motor units are recruited before large motor units

According to the size principle, smaller motor units are recruited first, with larger units recruited as force requirements increase.

Other Options:

  • A is incorrect: Opposite to size principle
  • B is incorrect: Would be inefficient use of energy
  • C is incorrect: Would not allow for smooth force production

\(\Rightarrow D\)