Which of the following explains why one-way synaptic transmission occurs?

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BlackTom AI · Accepted Answer

Let’s break down the question by examining what each option asserts about one-way synaptic transmission.
Option 1: 'Only dendrites can respond to electrical signals.' This is inaccurate because dendrites are not the sole responders to electrical signals at synapses; the key responders are the postsynaptic membranes at the synapse, which can be on dendrites, soma, or other parts of the postsynaptic neuron. The statement overgeneralizes and ignores that transmission involves chemical signaling across the synaptic cleft to specific receptors.
Option 2: 'The postsynaptic cell contains most of the synaptic vesicles.' This is false. Synaptic vesicles are primarily located in the presynaptic terminal, where they store neurotransmitters to be released into the synaptic cleft. The claim that the postsynaptic cell contains most vesicles contradicts the established anatomy of synaptic transmission.
Option 3: 'Myelination prevents two-way transmission of signals.' Myelination affects the speed of electrical conduction along axons and insulation of the axon but does not directly determine whether transmission is one-way or two-way at chemical synapses. The one-way nature is not due to myelination, making this statement irrelevant to the mechanism of synaptic signaling.
Option 4: 'Receptors for neurotransmitters are mostly found on the postsynaptic membrane.' This correctly identifies the core mechanism of chemical synaptic transmission: neurotransmitters are released from the presynaptic terminal, diffuse across the synaptic cleft, and bind to receptors on the postsynaptic membrane. This arrangement enables the postsynaptic cell to respond while the presynaptic side does not typically receive the same signal back, contributing to the one-way flow of information at chemical synapses.
In summary, the correct reasoning centers on the localization of neurotransmitter receptors on the postsynaptic membrane, which explains why signaling proceeds from presynaptic to postsynaptic elements in a directional, one-way fashion. The other options either misstate anatomical details or address factors not fundamental to the one-way nature of chemical synapses.

Bio 93 Section CDE 2025 Final Exam Practice, Part 1

Which of the following explains why one-way synaptic transmission occurs?

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Bio 93 Section CDE 2025 Final Exam Practice, Part 1

Which of the following explains why one-way synaptic transmission occurs?

View Explanation

Log in for full answers

Similar Questions

Question at position 3 Select all the ways a neurotransmitter can exit the space between neurons.DiffusionReuptake/recyclingAxon travelEnzymes will digest the neurotransmitter.Immune cells will attack.

At a synapse between two neurons, the dendrites release the neurotransmitters.

Consider a neuron-neuron synapse. Match the description with the presynaptic or postsynaptic neuron. 1: Action potential travels away from the synapse via this neuron. ____ 2: First in the chain of neurons. ____ 3: Second in the chain of neurons. ____ 4: Releases neurotransmitter. ____

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