Question at position 35 The site where a motor neuron's terminal meets the muscle fiber is called the ___________.Motor unitSynaptic cleftAxon terminalNeuromuscular junction (NMJ)单项选择题
A
Motor unit
B
Synaptic cleft
C
Axon terminal
D
Neuromuscular junction (NMJ)

Question

Question at position 35 The site where a motor neuron's terminal meets the muscle fiber is called the ___________.Motor unitSynaptic cleftAxon terminalNeuromuscular junction (NMJ)

BlackTom AI · Accepted Answer

The question asks for the name of the site where a motor neuron's terminal meets a muscle fiber.
Option 1: Motor unit — This term refers to a single motor neuron and all the muscle fibers it innervates, not the synaptic site itself. It describes a functional group of fibers rather than the connection point.
Option 2: Synaptic cleft — This is the narrow gap between a neuron’s axon terminal and the postsynaptic cell, but in the context of skeletal muscle, the specific structure at the muscle end is named differently and more precisely as the neuromuscular junction. The synaptic cleft is a component of the NMJ, not the full site name.
Option 3: Axon terminal — This is the end of the neuron where neurotransmitters are released, but it is located at the neuronal side of the connection. The question targets the interface with the muscle fiber as a holistic site, not just the terminal itself.
Option 4: Neuromuscular junction (NMJ) — This is the correct term for the specialized synapse between a motor neuron and a skeletal muscle fiber, encompassing the synaptic end bulb, the postsynaptic membrane of the muscle, and the synaptic cleft. It precisely names the site of communication between the nerve and muscle.

Question at position 35 The site where a motor neuron's terminal meets the muscle fiber is called the ___________.Motor unitSynaptic cleftAxon terminalNeuromuscular junction (NMJ)单项选择题

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