PYQSide ExamsMy practice

Neural Control and Coordination · Question 58

AIPMT 2000MCQMedium📈 Topic in 0% papers+4−1
1

Depolarization of axolemma during nerve conduction takes place because of

  1. equal amount of Na+ and K+ move out across axolemma
  2. Na+ move inside and K+ move more outside
  3. more Na+ outside
  4. none of these

Answer

(2) Na+ move inside and K+ move more outside

Solution

As per NCERT, when a stimulus is applied, the axonal membrane (axolemma) becomes freely permeable to Na+.

⇒ A rapid influx of Na+ reverses the polarity: the outer surface becomes negative and the inner surface positive, i.e., the membrane is depolarised.

The rise in Na+ permeability is short-lived and is followed by a rise in K+ permeability; K+ diffuses outside and restores the resting potential.

∴ Of the given options, movement of Na+ inside (with K+ moving out) explains the change.

Answer: (2)

AIPMT 2000

Keep practising — Neural Control and Coordination

2

Which food should be eaten during deficiency of rhodopsin in eyes?

  1. Carrot and ripe papayas
  2. Guava, banana
  3. Mango and potato
  4. None of the above
Out of syllabusAIPMT 2000

All Neural Control and Coordination PYQs →

PDFDownload Neural Control and Coordination PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Zoology chapters
Class 11Animal KingdomStructural Organisation in AnimalsBiomolecules (Biology)Digestion and AbsorptionBreathing and Exchange of GasesBody Fluids and CirculationExcretory Products and their EliminationLocomotion and MovementNeural Control and CoordinationChemical Coordination and Integration
Class 12Human ReproductionReproductive HealthEvolutionHuman Health and DiseaseBiotechnology: Principles and ProcessesBiotechnology and its ApplicationsBiology Experimental Skills