The resting membrane potential is established primarily due to:
1. Sodium-potassium pump
2. Efflux of potassium
3. Influx of sodium
4. Influx of chloride

Most sensory receptors function by producing depolarising potentials. Which of the following function by hyperpolarization rather than depolarization ?

1. proprioceptors
2. nociceptors
3. olfactory receptors
4. rods and cones

In a chemical synapse, when an impulse arrives at the axon terminal, it:
1. leads to the opening of the calcium channels at the post-synaptic membrane.
2. Stimulates the fusion of synaptic vesicles towards the pre-synaptic membrane.
3. causes the binding of the neurotransmitter of its receptors on the post-synaptic neuron.
4. activates the opening of the potassium channels in the axon terminal.

When a neuron is an resting state, ie, not conducting any impulse, the axonal membrane

is

1. equally permeable to both Na⁺ and K⁺ ions

2. impermeable to both Na⁺ and K⁺ ions

3. comparatively more permeable to K⁺ ions and nearly impermeable to Na⁺ ions

4. comparatively more permeable to Na⁺ ions and nearly impermeable to K⁺ ions

During the propagation of a nerve impulse, the action potential results from the movement of

1. K⁺ ions from extracelular fluid to intracellular fluid

2. Na⁺ ions from intracellular fluid to extracellular fluid

3. K⁺ ions from intracellular fluid to extracellular fluid

4. Na⁺ ions from extracellular fluid to intracellular fluid

In a neuron the concentration of intracellular potassium and extracellular sodium is in a

ratio of

1. 1:1

2. 30:1

3. 10:1

4. 3:1

Assertion  :  The imbalance in concentration of Na+, K+ and proteins generates resting potential.

Reason      :  To maintain the unequal distribution of Na+ & k+, the neurons use electrical energy.

Neurons are excitable cells because

The membrane of neuron is polarized because

When neuron is resting, which of the following is false with respect to that