Multiple Choice
Which protein functions as a motor protein that applies the power stroke during skeletal muscle contraction?
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8. Protein Function
Skeletal Muscle Contraction
Multiple Choice
In skeletal muscle sarcomeres, thin filaments are primarily composed of which protein?
A
Actin
B
Myosin
C
Titin
D
Desmin
Verified step by step guidance1
Understand the structure of skeletal muscle sarcomeres, which are the basic contractile units of muscle fibers composed of thick and thin filaments.
Recall that thin filaments in sarcomeres are primarily made up of a specific protein responsible for interaction with thick filaments during muscle contraction.
Identify the main protein of thin filaments, which is a globular protein that polymerizes to form filamentous structures.
Recognize that actin is the protein that forms the backbone of thin filaments, while myosin forms thick filaments, titin provides elasticity, and desmin is involved in structural support.
Conclude that the primary protein composing thin filaments in skeletal muscle sarcomeres is actin.
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