Bioelectricity – MCQs

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1. The resting membrane potential of a typical mammalian cell is approximately:





2. Which ion plays the most important role in generating resting potential?





3. The Goldman-Hodgkin-Katz equation is used to calculate:





4. The action potential is initiated when the membrane potential reaches:





5. The depolarization phase of an action potential is due to:





6. Repolarization in neurons is mainly caused by:





7. The refractory period ensures that:





8. Myelin sheath increases conduction velocity by:





9. Nodes of Ranvier are important for:





10. The Na⁺/K⁺ pump maintains:





11. Which ion triggers neurotransmitter release at synapses?





12. The conduction velocity of an action potential depends on:





13. Bioelectric potentials are generally measured in:





14. The equivalent circuit model of a cell membrane includes:





15. Which recording technique is used to measure single ion channel activity?





16. The Hodgkin-Huxley model describes:





17. Hyperpolarization occurs when:





18. Graded potentials are:





19. Action potentials follow the principle of:





20. The safety factor for conduction ensures:





21. The equivalent capacitance of the lipid bilayer allows:





22. Which ion channel is responsible for plateau phase in cardiac action potential?





23. The conduction velocity in unmyelinated axons is:





24. Electrical synapses transmit signals through:





25. The intracellular potential is always measured relative to:





26. Which ion movement generates inhibitory postsynaptic potentials (IPSPs)?





27. Demyelination disorders such as Multiple Sclerosis affect:





28. Which wave in ECG corresponds to ventricular depolarization?





29. The Nernst equation calculates:





30. Miniature end-plate potentials are observed at:





31. Which property differentiates graded potentials from action potentials?





32. The squid giant axon was used to study:





33. Voltage-gated sodium channels are blocked by:





34. The refractory period prevents:





35. Bioelectricity in muscles is mainly studied using:





36. Which wave in EEG is dominant during deep sleep?





37. Which ion has the highest intracellular concentration in neurons?





38. Synaptic delay is mainly due to:





39. The first phase of an action potential is:





40. The excitatory neurotransmitter at neuromuscular junction is:





41. Ohm’s law in bioelectricity relates:





42. Which technique measures summed electrical activity of the brain?





43. The membrane behaves like a:





44. Saltatory conduction occurs in:





45. The ionic current responsible for after-hyperpolarization is:





46. The driving force for ion movement is determined by:





47. Which recording technique is used in electroretinography (ERG)?





48. The axon hillock is important because:





49. Gap junctions allow:





50. Bioelectricity is essential for:





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