Muscle stretch reflex

[Reperfused]

In a muscle stretch reflex, which neurotransmitter is secreted by the afferent muscle spindle fiber when it synapses at the Alpha lower motor neuron?

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[Reperfused]

Also, I'm super confused between gamma motor neurons and Golgi tendon organs!!! I only understand alpha motor neuron perfectly. But the other two, ahhh make me scratch my head!
Can someone help please?