Textbook Question
Compare skeletal, smooth, and cardiac muscles in regard to their microscopic anatomy, location and arrangement in body organs, and function in the body.
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9. Muscle Tissue
Structure of a Skeletal Muscle
Multiple Choice
What are thin filaments in the sarcomere primarily composed of?
A
Titin
B
Tropomyosin
C
Actin
D
Myosin
Verified step by step guidance1
Understand the structure of a sarcomere: A sarcomere is the basic contractile unit of muscle fiber, composed of thick and thin filaments.
Identify the components of thin filaments: Thin filaments are primarily composed of actin, along with regulatory proteins such as tropomyosin and troponin.
Differentiate between thick and thin filaments: Thick filaments are primarily composed of myosin, while thin filaments are primarily composed of actin.
Recognize the role of actin in muscle contraction: Actin interacts with myosin during muscle contraction, allowing the sarcomere to shorten and generate force.
Clarify the function of tropomyosin: Tropomyosin is a regulatory protein that wraps around actin filaments, blocking myosin binding sites in a relaxed muscle state.
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