MCQ A.3.3. - BasicPhysiology.org

Created on March 26, 2023 By

wlammers_qzgo0ve6

MCQ A.3.3.

The Action Potential

1 / 5

Which ion is responsible for the repolarization phase of an action potential?

Na+

K+

Ca2+

Cl-

2 / 5

Which ion is responsible for the depolarization phase of an action potential?

Na+

K+

Ca2+

Cl-

3 / 5

In a particular nerve cell, an action potential had been initiated at t=0 msec. The duration of the depolarization is 4 msec and that of its repolarization is 10 msec. Now, I want to induce a second action potential. At which earliest time is it possible, using a very strong stimulus, to induce a second action potential?

t=0 msec

t=1 msec

t=2 msec

t=3 msec

t=10 msec

4 / 5

In a particular nerve cell, the resting potential is -80 mV and its threshold value is -65mV. We stimulate this cell with a stimulus of +10 mV. What will happen?

the stimulus is strong enough to initiate a full action potential

the stimulus is strong enough to initiate half an action potential

the stimulus is strong to initiate an action potential of 20 mV

the stimulus is not strong enough to initiate an action potential

the stimulus will initiate a negative action potential

5 / 5

In a particular nerve cell, the resting potential is -80 mV and its threshold value is -65mV. We stimulate this cell with a stimulus of +20 mV. What will happen?

the stimulus is strong enough to initiate half an action potential

the stimulus is strong to initiate an action potential of 20 mV amplitude

the stimulus is not strong enough to initiate any action potential

the stimulus is strong enough to initiate a full action potential

the stimulus should be -20 mV to initiate an action potential

Your score is

The average score is 60%

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