Which of the Following Become Connected by Myosin Cross-Bridges During

Question

Which of the following become connected by myosin cross-bridges during muscle contraction?
A) thin filaments and thick filaments
B) thick filaments and titin filaments
C) z disks and actin filaments
D) thick filaments and t-tubules
E) thin filaments and t-tubules

Accepted Answer

Myosin cross-bridges connect the thick and thin filaments during muscle contraction, causing the thin filaments to slide past the thick filaments and shortening the muscle fiber. Titin filaments provide structural support, z disks attach thin filaments to each other and the sarcomere, and t-tubules facilitate the transmission of nerve impulses to initiate muscle contraction.