Multiple Choice
In skeletal muscle sarcomeres, thin filaments are primarily composed of which protein?
30
views
8. Protein Function
Skeletal Muscle Contraction
Multiple Choice
In skeletal muscle, which of the following is NOT a protein found in the thin filament?
A
Tropomyosin
B
Myosin
C
Actin
D
Troponin
Verified step by step guidance1
Understand the composition of the thin filament in skeletal muscle. The thin filament primarily consists of actin, tropomyosin, and troponin proteins.
Recall that actin forms the backbone of the thin filament, providing the structural framework.
Recognize that tropomyosin is a regulatory protein that lies along the groove of the actin filament, blocking or exposing myosin-binding sites depending on calcium levels.
Know that troponin is a complex of three proteins attached to tropomyosin, which regulates muscle contraction by responding to calcium ions.
Identify that myosin is not part of the thin filament; instead, it is the main protein of the thick filament responsible for generating force during muscle contraction.
Related Videos
Related Practice
