Which of the following statements regarding whole-muscle contraction is TRUE?
A. The order of recruitment of motor units in a muscle is such that the last units recruited are those that fatigue most readily.
B. Motor units whose motor neurons have large-diameter cell bodies are recruited first, while motor units with smaller-diameter motor neurons are only activated as the level of activation in the spinal cord increases.
C. The order of recruitment of motor units in a muscle is such that the first units recruited generate the most tension.
D. Recruitment of one fast-glycolytic motor unit provides a smaller increment in whole-muscle tension than recruitment of one slow-oxidative motor unit.
E. The order of motor unit recruitment is independent of the size of the alpha motor neuron that innervates them.
Answer: A
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