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L12 , Action potential 2 (Excitability) , Physiology

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MCQ

1/During absolute refractory period the excitability

A) Increase

B) Decrease

C) Zero

D) Normal

2/All of the following are true about  Subnormal phase except

A)  It coincides with after hyper polarization.

B) Excitability is slightly reduced. Then return to normal

C) The excitability is increased

D) Some voltage gated k channels still opened

3/Subnormal phase of excitability concides with

A)  Descending limb

B)  After hyper polarization

C)  After depolarization

D)  Ascending limb

4/Which of the following is true about  biphasic action potential

  A) 2 electodes are placed inside the cell

B) 2 action potential are recorded by 2 electrodes  are at the same direction

C) When the depolarization wave reaches the area of the nerve between the 2 electrodes potential difference is zero

 D) When the depolarization wave reaches the second electrode potential difference is zero


True or False

5/ Rhythmicity is the ability of living tissue to respond to an adequate stimulus            

6/ Absolute refractory period concides with after depolarization            

 

Answers

1-C

2-C

3-B

4-C

5-F

6-F


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