Which of these occurs during an isometric contraction of a skeletal muscle?
A. The A bands shorten and the I bands stay the same length.
B. Sarcomere length does not change significantly.
C. Cross-bridges lock onto actin, similar to what occurs in rigor mortis.
D. The I bands shorten and the A bands stay the same length.
E. The thick and thin filaments slide past each other.
Answer: B
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