In maximally contracted muscle In the partially contracted muscle In the relaxed muscle • Actin filaments are pull towards the center of sarcomere • Actin filaments overlap in H zone • H zone disappear • Sarcomere become shorten • A band doesn’t change in length • I band become shorten • The actin are separated by a relatively small space in the H zone • I band relative shorten • A band remain unchanged • The distance of actin filaments in the H zone is large STRUCTURE OF SARCOMERE
• Based on Sliding-Filament theory by Huxley and Hanson d) Explain the mechanism of muscle contraction based on Sliding MECHANISM OF MUSCLE CONTRACTION - filament theory (C3) Relaxed muscle Muscle contraction