Question

Resources Lx Give Up? Hint Question 13 of 35 > Match a functional description to each component of thin filaments found in cardiac and skeletal muscle Tropomyosin Troponin Answer Bank a regulatory protein that blocks the thick filament binding sites a structural protein that binds the thick filament during the cross-bridge cycle a regulatory protein that binds calcium, causing a conformational change about us Careers privacy policy arm s cerca

Answer 1

hinds binds to actin filament & cross. bridge is formed thus muscle contraction takes place (3) Troponin - a regulatory protein th Calcium causing a conformational change. Explanation - Troponin is attached to the protein tropomyosin & lies within the groove between actin filaments in muscle tissue. In a Helared muscle, tropomyosin blocks the attachment site (active site of my actin filament, thus prevents muste muscle contraction. When the muscle is stimulated to contract by action potential, Calcium channels open in the sarcoplasmic reticulum & release calcium into sarcoplasm. some of this carcium is attached to troponin, which causes it to change shape , unmasking of active sites by tropomyosin & hence exposing the active sites for myosin on actin filament. Now myosin binds to action causing formation of cross bridge and contraction of muscle begins.