Dr Gawad Course Online Exam - Excitable - Lec 2 (Action Potential, Compound Action Potential, All Or None Rule)
9 MCQs (Only one correct answer)Each MCQ: 1 mark, Total mark: 9Allowed time: 10 minGood Luck
- 1.The main cause of depolarization of nerve is:
- A.
K outflux
- B.
Na influx
- C.
Cl outflux
- D.
None of the above
- 2.At stage of complete depolarization of action potential of the curve
- A.
K out flux is the major change
- B.
Na out flux is the major change
- C.
The potential difference between outer and inner surface is Zero
- D.
Na-K pump is acting with full capacity
- 3.Reversal of polarity, which is true:
- A.
Outer membrane is more negative than inner membrane.
- B.
Action potenial is – 50 mv
- C.
Potential magnitude is + 35 mv
- D.
None of the above
- 4.Repolarization of nerve coincides with:
- A.
Influx of Na
- B.
Out flux of K
- C.
Out flux of Cl
- D.
Impermeability of the membrane to protein
- 5.Ascending limb of nerve action potential is due to Na movement through
- A.
Leak channels
- B.
Ligand gated channels
- C.
Voltage gated channels
- D.
None of the above
- 6.Which of the following is a representation of hypopolarized state:
- A.
Stage of rapid depolarization
- B.
After depolarization
- C.
After hyperpolarization
- D.
All after potential stages
- 7.Which of the following is false regarding compound action potential:
- A.
The largest the diameter the fastest velocity conduction
- B.
Myleinated (medullated) nerves are faster than non myleinated
- C.
The larger the diameter the longer the duration of the spike
- D.
- the larger the diameter the bigger the magnitude of action potential
- 8.Which of the following is not applying all or none rule:
- A.
Single nerve fiber
- B.
Single nerve fiber of mixed nerve
- C.
Whole skeletal muscle
- D.
Cardiac muscle
- 9.The main cause of after hyperpolarization is
- A.
Delayed Na channel closure
- B.
Massive inward movement of Cl ions
- C.
Delayed voltage K channels closure
- D.
Na-K pump activation
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