Answer:
(b) The space occupied by the H zone will not change
Step-by-step explanation:
- The sarcomere is the contractile unit in a skeletal muscle.
- Thick myosin myofilaments are located in the central region of the sarcomere, which corresponds to the A band.
- Thin filaments united to the Z lines, extends to the interior of the A band until they reach the border of the H band.
- I band is formed solely of thin actin filaments, belonging to two sarcomeres adjacent to a Z line. (option (e) is correct)
- When the muscle contracts, the muscular fiber gets shorter and thicker due to the reduction in length of the sarcomere. The H line and the I band get shorter (Option (b) is not correct, but option (c) is correct). The Z lines get closer to the A band, meaning that they get closer to each other (Option (d) is correct). A band keeps constant in length (Option (a) is correct)
- This change is produced by movement mechanisms that involve a change in the relative position of actin and myosin filaments.