NEET · Biology
Cover the explicit NEET UG 2026 neural-control scope — neuron and nerves, CNS/PNS/visceral relationships and nerve-impulse generation/conduction — while separating it clearly from contextual, non-explicit sensory content.
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In short
For NEET UG 2026, Neural Control and Coordination explicitly covers neurons and nerves, the central, peripheral and visceral nervous systems, and the generation and conduction of nerve impulses.
Eye, ear and dedicated reflex/sensory sections are kept outside the current core on this page because they are not explicitly listed in the verified 2026 wording.
The official NEET UG 2026 syllabus and NCERT define content scope. No chapter weightage is asserted here.
This boundary reflects the verified NEET UG 2026 wording as recorded in this package; it does not restore older preparation-material content by default.
Input/dendritic region → soma → axon → terminal → next cell.
This is the standard NCERT functional relationship, not a claim that every neuron has identical morphology.
Myelinated fibres conduct by saltatory jumps between nodes; unmyelinated fibres conduct through successive adjacent activation.
Myelin electrically insulates portions of the axon. Myelinated fibres have exposed nodes that support saltatory conduction, with action potentials effectively regenerated node to node. Unmyelinated fibres lack that same continuous myelin arrangement and conduct through successive adjacent membrane activation. Unmyelinated does not mean unable to conduct.
CNS integrates; PNS connects; afferent carries information in, efferent carries commands out.
The official syllabus wording visibly names the visceral nervous system, so this term is used directly, with the autonomic relationship explained at NCERT depth.
The Na+/K+ pump moves three Na+ out for every two K+ in, contributing to the resting potential.
A resting neuron maintains unequal ionic distributions and selective membrane permeability, producing a negative interior relative to outside. Active transport contributes to maintaining gradients. NCERT describes the Na+/K+ pump moving three Na+ out for two K+ in as part of this mechanism.
Na+ permeability rise causes depolarisation; the subsequent K+ permeability rise causes repolarisation.
When a sufficient stimulus increases Na+ permeability at a membrane region, Na+ enters and the local membrane becomes less negative and then positive relative to outside — this is depolarisation. K+ permeability then rises and K+ leaves, helping restore the membrane toward resting polarity — this is repolarisation. Ion gradients are subsequently maintained or restored through membrane transport processes.
The impulse is not one packet of Na+ physically travelling from soma to terminal. Adjacent membrane regions sequentially undergo permeability changes and action-potential regeneration: unmyelinated fibres show successive adjacent membrane activation, while myelinated fibres show saltatory node-to-node propagation.
Synapse is not separately named in the official wording, but current NCERT uses it to complete neuron-to-neuron communication.
The official syllabus names generation/conduction of nerve impulse but does not separately list synapse. Current NCERT uses synaptic transmission to complete neuron-to-neuron communication. It is therefore included as NCERT support within the current impulse architecture, not as a separately named current-syllabus heading.
Chemical synapse sequence: presynaptic impulse → neurotransmitter release → synaptic cleft → receptor binding → postsynaptic membrane response. Electrical synapses use direct electrical coupling and are faster in the NCERT comparison.
Because CNS is explicitly current, a concise map may show the brain organised into forebrain, midbrain and hindbrain framework at NCERT depth, with the spinal cord as a central pathway/integration structure connecting brain and peripheral nerves. Unnecessary neuroanatomy expansion is avoided.
Believing depolarisation happens because K+ leaves the cell.
Recall gapWhy it happens
Both ions are involved in the action potential, which invites swapping their roles.
How it is corrected
Na+ entry drives depolarisation at NCERT depth.
Believing repolarisation happens because Na+ enters the cell.
Recall gapWhy it happens
The sequential nature of the two phases is easy to reverse under time pressure.
How it is corrected
K+ efflux helps restore polarity during repolarisation.
Picturing the nerve impulse as one ion packet moving end-to-end.
Knowledge gapWhy it happens
The word 'impulse' suggests something physically travels the length of the axon.
How it is corrected
Adjacent membrane segments regenerate the signal in sequence; no single packet travels the whole distance.
Assuming unmyelinated fibres cannot conduct impulses.
Knowledge gapWhy it happens
Myelination is strongly associated with fast conduction, which can be over-generalised.
How it is corrected
They conduct without the saltatory node-to-node pattern, through successive adjacent membrane activation.
Restoring eye, ear or reflex content as current-core because older notes include them.
Decision / selection errorWhy it happens
Older preparation materials often bundle sensory organs and reflexes with neural control.
How it is corrected
Use the verified 2026 boundary; these remain contextual and are not treated as current-core modules here.
Verified against the NTA NEET UG 2026 official Unit 5 wording and current NCERT Neural Control and Coordination and Biology Class XI Unit V contents. Eye, ear, dedicated sensory reception and reflex as a separate module are recorded as contextual, not explicit current scope, and are not rendered as current-core modules on this page.
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