객관식
Which muscle cell structure stores calcium ions that are used to trigger contraction?
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4. Tissues & Histology
Introduction to Muscle Tissue
객관식
In the context of the sliding filament theory, what function do the proteins actin and myosin perform?
A
They generate electrical impulses for muscle contraction.
B
They store calcium ions in the sarcoplasmic reticulum.
C
They transport oxygen within muscle cells.
D
They facilitate the contraction of muscle fibers.
검증된 단계별 안내1
Understand the sliding filament theory: This theory explains how muscles contract by the sliding of actin and myosin filaments past each other, which shortens the muscle fiber.
Identify the role of actin: Actin is a thin filament that provides a track for myosin heads to attach and pull, facilitating muscle contraction.
Identify the role of myosin: Myosin is a thick filament with heads that bind to actin, forming cross-bridges and pulling the actin filaments inward during contraction.
Recognize the interaction between actin and myosin: The myosin heads use ATP to change shape and pull the actin filaments, causing the muscle to contract.
Conclude the function of actin and myosin: Together, actin and myosin facilitate the contraction of muscle fibers by sliding past each other, which is the core mechanism of the sliding filament theory.
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