The binding of the neurotransmitter to receptors on the motor end plate causes which of the following to occur?

Binding causes voltageÂgated sodium channels to open in the motor end plate (junctional folds of the sarcolemma) and sodium enters the cell.
Binding causes chemically gated potassium channels to open in the motor end plate (junctional folds of the sarcolemma) and potassium enters the cell.
Binding of the neurotransmitter causes chemically gated sodium channels to open in the motor end plate (junctional folds of the sarcolemma) and sodium enters the cell.
Binding causes potassium voltageÂgated channels to open in the motor end plate (junctional folds of the sarcolemma) and potassium enters the cell.

Question

03-04-2019
Biology

contestada

The binding of the neurotransmitter to receptors on the motor end plate causes which of the following to occur?

Binding causes voltageÂgated sodium channels to open in the motor end plate (junctional folds of the sarcolemma) and sodium enters the cell.
Binding causes chemically gated potassium channels to open in the motor end plate (junctional folds of the sarcolemma) and potassium enters the cell.
Binding of the neurotransmitter causes chemically gated sodium channels to open in the motor end plate (junctional folds of the sarcolemma) and sodium enters the cell.
Binding causes potassium voltageÂgated channels to open in the motor end plate (junctional folds of the sarcolemma) and potassium enters the cell.

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BioWizard BioWizard · Answer 1 · 2019-04-10T13:31:38+02:00

The correct answer is: Binding of the neurotransmitter causes chemically gated sodium channels to open in the motor end plate (junctional folds of the sarcolemma) and sodium enters the cell.

Action potential travels through the membrane of the presynaptic cell causing the voltage-gated channels permeable to calcium ions to open. Ca2+ flow through the presynaptic membrane and increase the Ca concentration in the cell which will activate proteins attached to vesicles that contain a neurotransmitter (e.g. acetylcholine). Vesicles fuse with the membrane of the presynaptic cell, thereby release their contents into the synaptic cleft-space between the membranes of the pre- and postsynaptic cells. Neurotransmitter ACh binds to its receptors on the postsynaptic membrane and its binding causes depolarization of the target cell (muscle cell). Depolarization occurs because sodium enters the cell as a result of neurotransmitter receptor binding.