Which characteristic of a postural muscle is a result of having substantial amounts of type I mus-cle fibers?
a. Resists fatigue
b. Rapid response time
c. Little contractibility
d. Lacks a fascia lining
ANS: A
Postural muscles have more type I fibers, allowing them the high resistance to fatigue that is nec-essary to maintain the same position for extended periods. The ocular muscles have more type II muscle fibers, allowing them to respond rapidly to visual changes.
Little contractibility or lacking a fascia lining is associated with type I muscle fibers.
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