Nerve Impulse Conduction

Q.

Information is transmitted both quickly and accurately by electrical means through

1. Nerve code

2. Reflex arc

3. Nerve impulse

4. Brain signal

Q.

When your finger gets accidently caught at the door, the pain message is sent to your brain through:

1. Sensory Receptors

2. Medulla Oblangata

3. Homeostasis

4. Caffeine

Q.

The conduction of the nerve impulses through the neurons is similar to the conduction of electricity through a wire.

1. True

2. False

Q.

The membrane of an unstimulated neuron is unpolarised.

1. True

2. False

Q. During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?

1. First positive, then negative and continue to be negative
2. First negative, then positive and continue to be positive
   
3. First positive, then negative and again back to positive
4. First negative, then positive and again back to negative

Q.

Which one of the following describes saltatory conduction ?

1. Faster than conduction on an unmyelinated fiber

2. Occurs only if nodes of Ranvier are lacking

3. Occurs only if the myelin sheath is continuous

4. Slower than conduction on an unmyelinated fiber

Q.

Stimulation of a neuron in resting state causes _____.

1. Depolarisation

2. No change in the state of rest

3. Repolarisation

4. Hyperpolarization

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

1. $K^{+}$ ions from intracellular fluid to extracellular fluid
2. $N{a}^{+}$ ions from extracellular fluid to intracellular fluid
3. $K^{+}$ ions from extracellular fluid to intracellular fluid
4. $N{a}^{+}$ ions from intracellular fluid to extracellular fluid

Q. Which of the following statements is wrong regarding conduction of nerve impulse?

1. Fluid outside the axon has a high concentration of $N{a}^{+}$ and low concentration of $K^{+}$ in a resting neuron.
2. Ionic gradients are maintained by Na - K pumps across the resting membrane which transport $3N{a}^{+}$ ions outwards for $2K^{+}$ ions into the cell.
3. A neuron is polarised only when the outer surface of the axonal membrane possess a negative charge and its inner surface is positively charged.
4. Resting potential is the electrical potential difference across the resting membrane.
5. In a resting neuron, the axonal membrane is more permeable to $K^{+}$ ions and nearly impermeable to $N{a}^{+}ions$.

Q. During the transmission of nerve impulse throgh a nerve fibre, the potential on the innerside of the plasma membrane has which type of electric charge?

1. First negative then positive and again back to negative
   
2. First positive then negative and continue to be negative
   
3. First negative then positive and continue to be positive
   
4. First positive then negative and again back to positive