The ability to develop increasing levels of force in an intact muscle composed of both fast and slow twitch muscle fibers typically involves:
A. recruitment of slow twitch muscle fibers before fast twitch muscle fibers
B. tetany of fast twitch muscle at lower stimulus frequencies than slow twitch muscle
C. a progressive recruitment of more muscle fibers within a given motor unit
D. a progressive increase in the amplitude of the intracellular Ca++ transient
E. a progressive decrease in the threshold for an action potential in the skeletal muscle
ANS: A
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