Multiple Choice
In the context of the sliding filament theory, which structure releases calcium into the sarcoplasm to initiate muscle contraction?
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9. Muscle Tissue
Sliding Filament Theory and the Sarcomere
Multiple Choice
In the context of the sliding filament theory, what is the H band of the sarcomere?
A
The region that includes the Z line
B
The region containing only thick filaments
C
The region where thick and thin filaments overlap
D
The region containing only thin filaments
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. The thick filaments are primarily made of myosin, while the thin filaments are primarily made of actin.
Identify the different bands and lines within a sarcomere: The sarcomere is divided into several regions, including the A band, I band, H band, Z line, and M line. Each of these regions has specific characteristics based on the arrangement of thick and thin filaments.
Define the H band: The H band is a region within the A band of the sarcomere. It is characterized by containing only thick filaments (myosin) and is located in the center of the A band.
Differentiate the H band from other regions: Unlike the A band, which includes both thick and thin filaments, the H band contains only thick filaments. The I band contains only thin filaments, and the Z line is the boundary between adjacent sarcomeres.
Conclude with the correct identification: Based on the sliding filament theory and the structure of the sarcomere, the H band is the region containing only thick filaments.
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