THE CELL
CELL COMMUNICATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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More sodium would enter the sodium/potassium ion channels of the postsynaptic dendrite
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More potassium would enter sodium/potassium ion channels of the postsynaptic dendrite
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Fewer sodium/potassium ion channels would be opened in the postsynaptic dendrite
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Fewer vesicles in the pre-synaptic axon terminal would contain acetylcholine
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Detailed explanation-1: -With the stimulation of the presynaptic terminal, acetylcholine is released from the vesicles and into the synaptic cleft, where the neurotransmitter is free to bind with receptors. Binding with receptors can have different effects depending on the area of the nervous system that acetylcholine is affecting.
Detailed explanation-2: -What happens to the acetylcholine in the synaptic cleft once an action potential has been triggered in the postsynaptic neuron? We said that the acetylcholine is broken down by the acetylcholinesterase enzymes in the postsynaptic membrane and then reabsorbed into the presynaptic neuron for potential reuse later.
Detailed explanation-3: -If ACh remained within the synaptic cleft, it would continue to bind to acetylcholine receptors in the motor end plate region causing continued muscle contraction.
Detailed explanation-4: -At a chemical synapse, an action potential triggers the presynaptic neuron to release neurotransmitters. These molecules bind to receptors on the postsynaptic cell and make it more or less likely to fire an action potential.