Dr Gawad Physiology Course Online Exam - Excitable - Lec 3 – Les, Properties Of The Nerve

1. Which of the following is true regarding conduction of myelinated nerve fibers:

It is a continuous conduction

It is slower than that of unmyleinated fibers

It is in the form of jumping conduction

None of the above

2. Which of the following is the most excitable area of a myelinated nerve fiber:

The terminal axon

Cell body

Nodes of ranvier

The internodeal areas

3. Which of the following is true regarding conduction in unmyelinated nerve fibers:

It is in the form of saltatory conduction

It saves energy

It is local unpropagated

It is in the form of continuous conduction

4. The first point of repolarization is:

The last point depolarized

The first point stimulated (depolarized)

The myleinated area

None of the above

5. Which of the following is not a membrane stabilizer:

Procaine

Hypoxia

Novocaine

Alkalosis

6. Which of the following is true regarding strength-duration curve:

Utilization time is the fastest response by the strongest strength.

Rheobase strength leads to local excitatory state

The longer the chronaxie the lower the excitability

None of the above

7. Which of the following is false regarding local response (local excitatory state)

There is decrease in RMP

There is increase in excitability

It is propagated potential

Caused by subthreshold stimuli

Can be summated