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Each presynaptic terminal contains _________blank, which contain the neurotransmitter _________blank that, when released, cause ligand-gated Na+ channels to open in the motor end-plate. This causes _________blank in the muscle cell.Multiple Choicesynaptic vesicles; acetylcholine; depolarizationproteins; acetylcholine; repolarizationmitochondria; acetylcholinesterase; depolarizationACh receptors; acetylcholinesterase; repolarization

Question

Each presynaptic terminal contains _________blank, which contain the neurotransmitter _________blank that, when released, cause ligand-gated Na+ channels to open in the motor end-plate. This causes _________blank in the muscle cell.Multiple Choicesynaptic vesicles; acetylcholine; depolarizationproteins; acetylcholine; repolarizationmitochondria; acetylcholinesterase; depolarizationACh receptors; acetylcholinesterase; repolarization

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Solution

The correct answer is "synaptic vesicles; acetylcholine; depolarization".

Here's the step by step explanation:

  1. Each presynaptic terminal contains synaptic vesicles. These are small sacs within the neuron that store neurotransmitters.

  2. These vesicles contain the neurotransmitter acetylcholine. Neurotransmitters are chemicals that transmit signals across a synapse from one neuron to another 'target' neuron.

  3. When acetylcholine is released, it causes ligand-gated Na+ channels to open in the motor end-plate. The motor end-plate is a region of muscle fiber where a neuron makes a synaptic connection.

  4. This opening of Na+ channels causes depolarization in the muscle cell. Depolarization is a change within a cell, during which the cell undergoes a shift in electric charge distribution, resulting in less negative charge inside the cell. This is part of the process that leads to the firing of the neuron.

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