Multiple Choice
What protein are the thick filaments in skeletal muscle primarily composed of?
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9. Muscle Tissue
Structure of a Skeletal Muscle
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The contractile portion of the thin filament is composed of what protein?
A
Tropomyosin
B
Myosin
C
Troponin
D
Actin
Verified step by step guidance1
Understand the structure of the thin filament in muscle cells. The thin filament is primarily composed of actin, along with regulatory proteins such as tropomyosin and troponin.
Recognize that actin is the main contractile protein in the thin filament. It forms a helical structure that serves as the backbone of the filament.
Identify the role of actin in muscle contraction. Actin interacts with myosin, the thick filament protein, to facilitate contraction through the sliding filament mechanism.
Differentiate between actin and other proteins listed. Tropomyosin and troponin are regulatory proteins that control the interaction between actin and myosin, but they are not the contractile proteins themselves.
Conclude that actin is the correct answer as it is the primary contractile protein in the thin filament, responsible for muscle contraction.
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