Use the word bank to identify the labeled structures of the antibody in the diagram: antigen,antigen-binding site,variable region,constant region,light chain,heavy chain.Briefly describe the structure. 
Definitions:
Motor Unit
A single motor neuron and all of the muscle fibers it innervates, working together to produce a contraction.
Neuromuscular Junction
The point of contact between a motor neuron and the muscle fiber it controls, crucial for muscle contraction.
Axon Terminal
The endpoint of a neuron's axon where neurotransmitters are released to send signals to other neurons or muscles.
Motor End Plate
A specialized area of muscle cell membrane that interacts with a motor neuron to receive neural signals, facilitating muscle contraction.
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