The junction at which an impulse travels from one neuron to another is called:

Appeared in: AIIMS Nagpur NO- 2020

Explanation

A synapse is the specific anatomical and functional junction between two neurons.
It allows for the transmission of nerve impulses, either electrically or chemically, from a presynaptic neuron to a postsynaptic neuron.
This structure includes the axon terminal, the synaptic cleft (the gap), and the dendrite or cell body of the next neuron.
Transmission across the synapse is typically mediated by chemical messengers called neurotransmitters.

Option A: An axon is the part of a single neuron that carries the impulse away from the cell body. It is the transmission cable, not the connection point or junction.
Option C: This is a general, non-scientific term for the nerve impulse or signal itself. It describes the information being sent, not the physical structure of the junction.
Option D: A stimulus is the trigger that initiates a nerve impulse in the first place (e.g., light, sound, touch). It is the cause of the signal, not the junction for its transmission.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Neuronal Communication and Synapse Function as background academic context rather than a clinical decision trigger.
Many neurological and psychiatric medications work by targeting synapses. For example, Selective Serotonin Reuptake Inhibitors (SSRIs) used for depression act by increasing the amount of the neurotransmitter serotonin in the synaptic cleft.
Diseases like Parkinson's and Myasthenia Gravis are caused by problems with neurotransmission at the synapse.
Understanding synaptic function is crucial for nurses to comprehend the mechanism of action of various drugs and the pathophysiology of neurological disorders.

How to Approach the Question

First, identify the key terms in the question stem: 'junction', 'impulse travels', and 'one neuron to another'.
This is a factual recall question asking for the specific name of an anatomical structure.
Analyze the options based on your knowledge of neuroanatomy.
Option A, 'Axon', is a part of a neuron, not a junction.
Option C, 'Nerve message', describes the signal, not the structure.
Option D, 'Stimulus', is the trigger for the signal, not the junction.

Concept Tested & Keywords

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E6 Psychology Morgan King 9e Part 1 pp. 66-68, 65-67

E6 Psychology Applied Sreevani 6e Sem1 p. 45-47

Practise the full AIIMS Nagpur NO- 2020

Attempt every question from this paper in a timed mock, then review the full solution for each one.