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Multiple Choice
Which protein is primarily responsible for the thick filaments in muscle tissue?
A
Tropomyosin
B
Myosin
C
Actin
D
Troponin
Verified step by step guidance
1
Step 1: Understand the structure of muscle tissue. Muscle tissue is composed of repeating units called sarcomeres, which contain thick and thin filaments responsible for contraction.
Step 2: Identify the components of the thick and thin filaments. Thick filaments are primarily composed of the protein myosin, while thin filaments are primarily composed of actin, along with regulatory proteins such as tropomyosin and troponin.
Step 3: Learn the role of myosin in muscle contraction. Myosin is a motor protein that interacts with actin during contraction. Its heads bind to actin and use ATP to generate force, pulling the thin filaments toward the center of the sarcomere.
Step 4: Differentiate between the proteins listed in the question. Tropomyosin and troponin are regulatory proteins associated with thin filaments, while actin is the main structural protein of thin filaments. Myosin is the primary protein of thick filaments.
Step 5: Conclude that the protein primarily responsible for the thick filaments in muscle tissue is myosin, based on its structural and functional role in the sarcomere.