Compared to neuromodulators, traditional neurotransmitters are different because they...

Question

BlackTom AI · Accepted Answer

When comparing traditional neurotransmitters to neuromodulators, we need to evaluate what each option claims and how it fits with known neurochemical distinctions.
Option a: '... are naturally occurring chemicals synthesised by special neurons in the brain.' Both traditional neurotransmitters and neuromodulators are synthesized by neurons. The phrase 'special neurons' adds no meaningful distinction and is not an accurate differentiator between the two classes. This makes the statement misleading as a sole differentiator.
Option b: '... typically affect larger groups of neurons.' This describes neuromodulators more accurately, not traditional neurotransmitters. Neuromodulators often diffuse to influence larger networks and have more widespread, slower effects, whereas traditional neurotransmitters typically act at well-defined synapses on specific postsynaptic targets. Therefore, this option characterizes neuromodulators rather than traditional neurotransmitters and is incorrect as the stated difference.
Option c: '... are always released from presynaptic terminals after the neuron fires.' This captures a core conventional view: traditional neurotransmitters are released from presynaptic terminals in response to action potentials, mediating fast, point-to-point synaptic transmission. The word 'always' is strong, but the general principle aligns with the classic distinction that neurotransmitters are released at synapses from presynaptic terminals, whereas neuromodulators can be released from non-synaptic sites and can have diffuse effects. This option reflects the key practical difference in release site and mode of action between the two classes, making it the best answer among the choices.
Option d: '... are slower in neurotransmission' This is incorrect because traditional neurotransmitters mediate fast synaptic transmission, whereas neuromodulators are typically slower. Labeling traditional neurotransmitters as slower contradicts the established understanding and would be inaccurate.
In summary, option c most closely aligns with the fundamental distinction commonly taught: traditional neurotransmitters are released from presynaptic terminals in response to neuronal firing to mediate rapid, targeted signaling, whereas neuromodulators often engage broader, slower modulation via diffuse release.

Compared to neuromodulators, traditional neurotransmitters are different because they...单项选择题

类似问题

Neurotransmitters are mainly stored within the:[Fill in the blank]

Question at position 14 What does a neurotransmitter do?It measures the amount of activity in a brain.It either excites or inhibits a neuron.It flows through the bloodstream.It conveys information from one brain to another.

Neurotransmitters are important because they

Co-transmission describes the process whereby:

Question at position 36 The electrical impulse in the motor neuron leads to the release of the neurotransmitter ____________, which is stored at the end of the axon terminals.SerotoninDopamineNorepinephrineAcetylcholine (ACh)

The figure below shows an example of one type of chemical synapse. In the ANS this synapse is likely to use as transmitter

With regards to neurotransmitters and neuromodulators, which of the following options are true?

Acetylcholine exerts its effect by:

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单