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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 change?
Options
(a) First positive, then engative and continue to be positive
(b) First negative, then positive and continue to be positive
(c) First positive, then negative and again back to positive
(d) First negative, then positive and again back to negative
Correct Answer:
First negative, then positive and again back to negative
Explanation:
Once the events of depolarization have occurred, a nerve impulse or spike is initiated. Action potential is another name of nerve impulse. It lasts about 1 msec (millisecond). The stimulated, negatively charged point on the outside of the membrane sends out an electrical current to the positive point (still polarized adjacent to it). This local current causes the adjacent inner part of the membrane to reserve its potential from -70 mV to +30 mV. The reversal repeats itself over and over until the nerve impu
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Topics: Locomotion and Neural Control
(33)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In the light of carrier concept the transport of ion across the membrane is
- The vital morphological and physiological units of a mammalian kidney are
- Some vascular bundles are described as open because these
- SirJC Bose proposed which of the following theory to explain the process of
- Nitrogen fixation in root nodules of Alnus is brought about by:
Topics: Locomotion and Neural Control (33)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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