47. Muscle Systems
Musculoskeletal System
Multiple Choice
Multiple ChoiceWhich statement about muscle contraction is correct?
A
Thick filaments stretch, whereas thin filaments stay the same length.
B
Thin filaments stretch, whereas thick filaments stay the same length.
C
A typical muscle fiber at rest contains enough ATP for millions of contractions.
D
Iron and fats bound to actin play a critical role in muscle cell contraction and relaxation.
E
Neither thin nor thick filaments change in size, although the area of overlap between them increases.
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