Conduction along membrane is dependent on all of the following EXCEPT: March 2013
Correct Answer: Fe2+
Description: Ans. C i.e. Fe2+ A decrease in extracellular Ca2+ concentration increases the excitability of nerve and muscle cells by decreasing the amount of depolarization necessary to initiate the changes in the Na+ and K+ conductance that produce the action potential. Conversely, an increase in extracellular Ca2+ concentration can stabilize the membrane by decreasing excitability.
Category:
Physiology
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