Neuromuscular Junction
Flashcard
•
Biology
•
11th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is the function of synaptic vesicles in the neuromuscular junction?
Back
Synaptic vesicles store neurotransmitters that are released into the synaptic cleft to transmit signals between the nerve cell and muscle cell.
2.
FLASHCARD QUESTION
Front
Define a motor unit in the context of neuromuscular junctions.
Back
A motor unit consists of one motor neuron and all the skeletal muscle fibers it innervates.
3.
FLASHCARD QUESTION
Front
What role does the sarcolemma play in the neuromuscular junction?
Back
The sarcolemma is the membrane of the muscle cell that receives signals from the motor neuron at the neuromuscular junction.
4.
FLASHCARD QUESTION
Front
What is the synaptic cleft and its significance?
Back
The synaptic cleft is the gap between the nerve cell and the sarcolemma, where neurotransmitters are released to facilitate communication.
5.
FLASHCARD QUESTION
Front
What initiates the action potential in the sarcolemma?
Back
The influx of sodium ions into the sarcolemma initiates the action potential, leading to muscle contraction.
6.
FLASHCARD QUESTION
Front
Explain the process of neurotransmitter release at the neuromuscular junction.
Back
When an action potential reaches the nerve terminal, it triggers the synaptic vesicles to fuse with the presynaptic membrane and release neurotransmitters into the synaptic cleft.
7.
FLASHCARD QUESTION
Front
What neurotransmitter is primarily involved in muscle contraction at the neuromuscular junction?
Back
Acetylcholine (ACh) is the primary neurotransmitter that stimulates muscle contraction.
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