Multiple Choice
In skeletal muscle sarcomeres, thick filaments are primarily composed of which protein?
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8. Protein Function
Skeletal Muscle Contraction
Multiple Choice
In skeletal muscle, which of the following is NOT a protein found in the thin filament?
A
Troponin
B
Myosin
C
Tropomyosin
D
Actin
Verified step by step guidance1
Step 1: Understand the composition of the thin filament in skeletal muscle. The thin filament primarily consists of actin, tropomyosin, and troponin proteins.
Step 2: Recall that actin forms the backbone of the thin filament, providing the structural framework.
Step 3: Recognize that tropomyosin is a regulatory protein that lies along the actin filament, blocking or exposing myosin-binding sites depending on muscle contraction state.
Step 4: Know that troponin is a complex of three proteins attached to tropomyosin, which binds calcium ions to regulate muscle contraction.
Step 5: Identify that myosin is not part of the thin filament but is the main protein of the thick filament, responsible for generating force during contraction.
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