09/03/2026
Time for a quick A&P review! đ§ Do you know which part of the sarcomere stays the exact same length when a muscle contracts? Put your answer in the comments!
The correct answer is C! The A-band represents the entire length of the thick filament (myosin), which does not change length during contraction. The I-band and H-zone shorten, and the Z-lines move closer together as the sarcomere contracts.