What does the end plate potential do?

End plate potentials (EPPs) are the voltages which cause depolarization of skeletal muscle fibers caused by neurotransmitters binding to the postsynaptic membrane in the neuromuscular junction. They are called “end plates” because the postsynaptic terminals of muscle fibers have a large, saucer-like appearance.

Is end plate potential an action potential?

The end-plate potential is a graded potential (it is not all-or-none) that propagates electrotonically to the neighboring patch of muscle fiber membrane where it initiates an action potential on the muscle much like it does on unmyelinated nerves.

What happens at the motor end plate?

Neuromuscular junctions, also called motor end plates, are specialised chemical synapses formed at the sites where the terminal branches of the axon of a motor neuron contact a target muscle cell. It contains multiple mitochondria and synaptic vesicles where the transmitter acetylcholine is stored.

Is end plate potential regenerative?

The smallest of the three stimuli causes a response much like that for a patch. A slightly larger EPP has two bumps, the first the local regenerative response and the second caused by the spread of depolarization from membrane away from the end-plate that is undergoing regenerative activity.

Is end plate potential monophasic?

The EPP is monophasic because external currents flow only toward the end-plate zone from adjacent regions.

What is motor end plate potential?

end-plate potential (EPP), chemically induced change in electric potential of the motor end plate, the portion of the muscle-cell membrane that lies opposite the terminal of a nerve fibre at the neuromuscular junction. This redistribution of ions slightly depolarizes the membrane.

What structure contains the motor end plate?

The terminal branch of each motor neuron axon forms a large synapse called the motor end plate or neuromuscular junction on the muscle surface (see Fig. 17.9). These nerve endings are filled with synaptic vesicles containing the neurotransmitter acetylcholine.

How does an end plate potential lead to an action potential in skeletal muscle?

When a nerve impulse releases the neurotransmitter acetylcholine from the nerve terminal, it binds to channel-shaped receptor molecules on the end plate, opening the channels and allowing positively charged sodium ions to flow into the muscle cell. The action potential will then stimulate the muscle cell to contract.

How does curare cause paralysis?

Research has shown that curare causes a weakening or paralysis of skeletal muscles by interfering with the transmission of nervous impulses between the nerve axon and the contraction mechanism of the muscle cell.