Multiple Choice
What protein primarily composes the thin filaments in the sarcomere according to the sliding filament theory?
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9. Muscle Tissue
Structure of a Skeletal Muscle
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Which part of the sarcolemma contains acetylcholine receptors?
A
Sarcoplasmic reticulum
B
Motor end plate
C
T-tubules
D
Z line
Verified step by step guidance1
Understand the structure of a muscle fiber: The sarcolemma is the cell membrane of a muscle cell, and it plays a crucial role in muscle contraction.
Identify the role of acetylcholine: Acetylcholine is a neurotransmitter that is released from motor neurons and binds to receptors on the muscle cell to initiate contraction.
Locate the motor end plate: The motor end plate is a specialized region of the sarcolemma at the neuromuscular junction where the motor neuron communicates with the muscle fiber.
Recognize the function of the motor end plate: This area contains a high density of acetylcholine receptors, which are essential for receiving the neurotransmitter signal.
Differentiate from other structures: The sarcoplasmic reticulum stores calcium ions, T-tubules help propagate action potentials, and the Z line is part of the sarcomere structure, none of which contain acetylcholine receptors.
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