Smooth body movements result from
A) large numbers of motor units in complete tetanus throughout the contraction.
B) small numbers of motor units firing in a "single twitch" fashion simultaneously.
C) isometric contractions only.
D) both incomplete and complete titanic contractions of motor units contracting out of phase with each other.
Answer: D) both incomplete and complete titanic contractions of motor units contracting out of phase with each other.
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