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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
Related Questions: - Exponential growth occurs in
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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
- Exponential growth occurs in
- The bone marrow is composed of
- Upon stimulation of skeletal muscles calcium is immediately made available
- Which of the following situation will be fatal to first foetus?
- vascular bundles in monocotyledons are considered closed because
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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