The synaptic knob releases acetylcholine into the synaptic cleft, which is received by receptors on the motor end plate. which structure does this describe

It portrays the neuromuscular junction of a skeletal muscle. 
The breakdown items are consumed by the pre-synaptic neuron by endocytosis and used to re-combine more neurotransmitter, utilizing vitality from the mitochondria. The Cytoplasm in the Synaptic Knob has a high extent of specific organelles. These incorporate smooth endoplasmic reticulum, mitochondria, and vesicles.