Multiple Choice
Thin filaments are composed of how many strands of fibrous actin?
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9. Muscle Tissue
Sliding Filament Theory and the Sacromere
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Which statement best describes a sarcomere?
A
A sarcomere is the basic contractile unit of muscle fiber, defined by the area between two Z lines.
B
A sarcomere is a protein that binds to calcium ions during muscle contraction.
C
A sarcomere is a type of connective tissue that surrounds muscle fibers.
D
A sarcomere is a neurotransmitter released at the neuromuscular junction.
Verified step by step guidance1
Understand the structure of a sarcomere: A sarcomere is the fundamental unit of striated muscle tissue, responsible for muscle contraction.
Identify the boundaries of a sarcomere: It is defined by the area between two Z lines (or Z discs), which are structures that anchor the actin filaments.
Recognize the components within a sarcomere: It contains thick filaments (myosin) and thin filaments (actin), which slide past each other during muscle contraction.
Differentiate a sarcomere from other muscle-related terms: Unlike proteins that bind calcium, connective tissues, or neurotransmitters, a sarcomere is specifically the contractile unit.
Conclude with the correct description: A sarcomere is the basic contractile unit of muscle fiber, defined by the area between two Z lines.
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