Thick filaments are made of which protein?

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Study for the Anatomy and Physiology Muscular System Test. Prepare with flashcards and multiple choice questions; each question provides hints and explanations. Get ready to excel in your exam!

Multiple Choice

Thick filaments are made of which protein?

Explanation:
Thick filaments are made of the motor protein myosin. Myosin molecules assemble into a filamentous backbone with globular heads that project outward to form cross-bridges with actin on the thin filaments. The interaction between these heads and actin, powered by ATP hydrolysis in the myosin head, drives the sliding of filaments that shortens the sarcomere during contraction. Thin filaments, by contrast, are mainly actin and are regulated by troponin and tropomyosin to control when myosin can bind. This is why myosin is the correct choice for the protein that makes up the thick filaments.

Thick filaments are made of the motor protein myosin. Myosin molecules assemble into a filamentous backbone with globular heads that project outward to form cross-bridges with actin on the thin filaments. The interaction between these heads and actin, powered by ATP hydrolysis in the myosin head, drives the sliding of filaments that shortens the sarcomere during contraction. Thin filaments, by contrast, are mainly actin and are regulated by troponin and tropomyosin to control when myosin can bind. This is why myosin is the correct choice for the protein that makes up the thick filaments.

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