Which of these statements describes the motor end plate
A)It contains receptor sites that are capable of binding curare.
B)It contains the neurotransmitter acetylcholine on its membrane.
C)It experiences an increase in permeability to cations when combined with acetylcholine.
D)It is a junction between two motor neurons.

Question

Quizplus · Accepted Answer

The motor end plate is a specialized area of the muscle fiber membrane that contains acetylcholine receptors. When acetylcholine binds to these receptors, the membrane experiences an increase in permeability to cations, such as sodium and calcium ions, which triggers an action potential and leads to muscle contraction. Choice A is incorrect because curare binds to acetylcholine receptors and blocks their activity, therefore preventing muscle contraction. Choice B is incorrect because acetylcholine is the neurotransmitter released by the motor neuron onto the motor end plate, not present on the membrane. Choice D is incorrect because the motor end plate is only a junction between a motor neuron and a muscle fiber.

Which of These Statements Describes the Motor End Plate