Question at position 27 The space between the neuron and the muscle is the __________. motor unit motor end plate synaptic cleft synaptic knobSingle choice
A
motor unit
B
motor end plate
C
synaptic cleft
D
synaptic knob

Question

Question at position 27 The space between the neuron and the muscle is the __________. motor unit motor end plate synaptic cleft synaptic knob

BlackTom AI · Accepted Answer

The question asks about the space between a neuron and a muscle: what is it called? 
Option 1: motor unit. A motor unit refers to a single motor neuron and all the muscle fibers it innervates, not the space between neuron and muscle. So this choice describes a structural unit of innervation, not the gap itself.
Option 2: motor end plate. The motor end plate is the specialized part of the muscle fiber membrane at the end, where the synapse occurs, but it is not the space; it is the postsynaptic region that receives the signal.
Option 3: synaptic cleft. Correct—this is the gap or space that separates the presynaptic neuron terminal from the postsynaptic muscle membrane, through which neurotransmitter must diffuse to trigger a response.
Option 4: synaptic knob. The synaptic knob (terminal bouton) is the swelling at the end of the neuron that releases neurotransmitter, not the space itself.
Thus, the space between the neuron and the muscle is the synaptic cleft.

Question at position 27 The space between the neuron and the muscle is the __________. motor unit motor end plate synaptic cleft synaptic knobSingle choice

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