Multiple Choice
Which of the following is false concerning the sliding-filament model of muscle contraction?
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8. Protein Function
Skeletal Muscle Contraction
Multiple Choice
In skeletal muscle contraction, the thin filaments of the sarcomere are primarily composed of which protein?
A
Actin
B
Myosin
C
Nebulin
D
Titin
Verified step by step guidance1
Understand the structure of the sarcomere, which is the basic contractile unit of skeletal muscle. It consists of thick and thin filaments arranged in a specific pattern.
Recall that the thick filaments are primarily composed of the protein myosin, which interacts with thin filaments during contraction.
Identify the main protein component of the thin filaments. The thin filaments are mainly made up of actin, along with regulatory proteins like tropomyosin and troponin.
Recognize that nebulin and titin are other sarcomeric proteins but serve different roles: nebulin is associated with thin filament length regulation, and titin provides elasticity and structural support.
Conclude that the thin filaments of the sarcomere are primarily composed of actin, which is essential for muscle contraction through its interaction with myosin.
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