Which of the following factor regulate rate of firing of axons during nerve conduction?
Correct Answer: Na+ channels opening
Description: Chemical, mechanical, or electrical excitation can activate a neuron leading to the generation of a nerve impulse. When the depolarization exceeds the threshold level of -55 mV, activated sodium channels cause a flood of Na+ ions into the cell which drives fuher depolarization. This causes a relative excess of cations in the cell, which eventually leads to a membrane potential of +35 mV. If the initial stimulus is less than -55 mV, few Na+ channels are opened and the threshold level is never reached. As a result, nerve conduction is an all-or-none response. Ref: Beck-Yoo K. (2012). Chapter 19. The Nervous System. In L.W. Janson, M.E. Tischler (Eds), The Big Picture: Medical Biochemistry.
Category:
Physiology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now