Tag: generation of nerve impulse

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Multiple choice biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

Depolarisation of nerve cell involves

  1. Influx of $K^+$
  2. Influx of N$a^+$
  3. Influx of C$a^{2+}$ and Cl
  4. Efflux of N$a^{2+}$
  5. Efflux of C$a^{2+}$ and Cl
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Depolarization occurs when the resting membrane potential becomes less negative. This is primarily caused by the rapid opening of voltage-gated sodium channels, allowing Na+ to rush into the cell.

Multiple choice biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

In resting stage of neuron, diffusion due to concentration gradient will drive

  1. $K^+$ into cell
  2. $K^+$and N$a^+$ out of cell
  3. N$a^+$ into cell
  4. N$a^+$ out of cell
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the resting state, there is a high concentration of Na+ outside the cell and a low concentration inside. Due to the concentration gradient, Na+ ions have a natural tendency to diffuse into the cell, though the membrane is relatively impermeable to them at rest.

Multiple choice biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

At resting stage nerve cell has

  1. Low $K^+$ outside and high N$a^+$ inside
  2. High $K^+$ inside and high N$a^+$ outside
  3. High $K^+$ inside and low N$a^+$ outside
  4. High $K^+$ outside and low N$a^+$ inside
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

At resting stage, the Na-K pump maintains a high concentration of K+ inside the neuron and a high concentration of Na+ outside the neuron.

Multiple choice biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

A polarised neuron is the one that is

  1. Conducting stimulus

  2. At resting potential

  3. Having action potential

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A polarized neuron is one that is at its resting potential, meaning there is a stable difference in electrical charge across the membrane (negative inside, positive outside).

Multiple choice biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

During conduction of nerve impulse

  1. N$a^+$ moves out of axoplasm
  2. N$a^+$ moves into axoplasm
  3. $K^+$ moves into axoplasm
  4. C$a^{2+}$ moves into axoplasm
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During the depolarization phase of a nerve impulse, voltage-gated sodium channels open, allowing Na+ to move down its concentration gradient into the axoplasm.