Multiple Choice
What are the two main protein filaments involved in the sliding filament theory within a sarcomere?
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9. Muscle Tissue
Sliding Filament Theory and the Sacromere
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What is the main component of thin filaments in the sarcomere?
A
Tropomyosin
B
Myosin
C
Actin
D
Titin
Verified step by step guidance1
Understand the structure of the sarcomere, which is the basic unit of a muscle's striated muscle tissue.
Recognize that the sarcomere is composed of thick and thin filaments. Thick filaments are primarily made of myosin.
Identify the components of thin filaments, which include actin, tropomyosin, and troponin.
Focus on actin, which is the main protein that forms the backbone of the thin filament. It is a globular protein that polymerizes to form long chains or filaments.
Remember that tropomyosin and troponin are regulatory proteins associated with actin in the thin filament, but actin itself is the primary structural component.
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