Motor end plate is a -
A)Neuromuscular junction
B)Plate of motor neuron
C)Dendron of motor neuron
D)Gradient of proton motive force

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Hint: Motor end plate is a chemical synapse junction. It helps the motor neuron to transmit signal to the fibres of muscles which causes muscle contraction. It initiates the secretion of acetylcholine which helps in transmission of impulses.

Complete answer:
The motor end plate is known as neuromuscular junction. It is differentiated into synapse (junction between neurons), different neurons, muscle cells. It is located near the midpoint of the muscle fibre.

In the receptors are embedded numerous receptors that are long proteins which form the channel through the membrane. A nerve impulse stimulates the release of neurotransmitter acetylcholine from the synaptic vesicles. A nerve impulse stimulates the muscle fibres of a motor unit. A reaction starts in the sarcomere between the myosin and the actin filaments.
Acetylcholine binds to the receptors which open the channel and the sodium ions flow into the end plate. An end plate potential is initiated which is an electrical event which leads to the contraction of the muscle fibre.
Dendron- It is the thread-like extension of nerve cells.
Proton motive force- It is the force that stimulates the movement of protons across the membrane.

Hence, the correct answer is option (A)

Note: Acetylcholine is a neurotransmitter released by the parasympathetic nervous system. It contacts smooth muscles, increases secretion, dilates blood vessels, and slows heart rate. It functions in the brain and body of animals. It sends signals to other cells like neurons, gland cells.