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Universiti
Sains

Neuromuscular Junction

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MASPAITILLA MA

28

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13 soalan

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# 1pilihan
During muscle contraction, what role does calcium play?
It binds to actin to initiate contraction
It binds to troponin complex, allowing myosin head to bind to actin
It provides energy for muscle contraction
It breaks down ATP
# 2Jawapan pendek
What is the primary neurotransmitter released at the neuromuscular junction?
Acetylcholine
acetylcholine
# 3pilihan
What is the function of the enzyme acetylcholinesterase at the neuromuscular junction?
Synthesize acetylcholine
Break down acetylcholine
Convert ATP to ADP
Bind to nicotinic receptors
# 4pilihan
What is the role of calcium ions at the neuromuscular junction?
Initiate action potential
Facilitate acetylcholine release
Break down neurotransmitters
Bind to muscle fibers
# 5pilihan
Which structure in the muscle fiber is responsible for propagating the action potential?
Myofibril
Sarcoplasmic reticulum
T-tubule
Mitochondria
# 6pilihan
What is the synaptic cleft?
The gap between two neurons
The gap between neuron and muscle fiber
The space within the neuron
The gap between muscle fibers
# 7pilihan
Which ion channel opens in response to the action potential in the presynaptic neuron at the neuromuscular junction?
Potassium
Sodium
Calcium
Chloride
# 8Jawapan pendek
Which enzyme breaks down acetylcholine in the synaptic cleft?
Acetylcholinesterase
acetylcholinesterase
# 9pilihan
What structure in the muscle cell receives the signal from the motor neuron?
Sarcoplasmic reticulum
Myofibril
Motor end plate
T-tubule
# 10pilihan
Which ion channel opens first when an action potential reaches the neuromuscular junction?
Voltage-gated Potassium channels
Voltage-gated Calcium channels
Voltage-gated Sodium channels
Ligand-gated Ion channels
# 11pilihan
What is the primary function of the neuromuscular junction?
Sensory signal transmission
Chemical digestion
Signal transmission from nerve to muscle
Blood filtration
# 12Jawapan pendek
Which ion is crucial for triggering the release of acetylcholine into the synaptic cleft?
Calcium
# 13Jawapan pendek
What is the gap called between the nerve ending and the muscle fiber at the neuromuscular junction?
Synaptic cleft
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