Practice question

Correct option is C, -55 mV. In Action potential, the accurate description is -55 mV, and that is what you should commit to memory. Keep the definition tight and the role clear — -55 mV is the option that correctly names the structure, process, or principle asked for in Action potential. Then -55 mV is the answer you can defend. Check yourself by covering the options and writing the answer first, then matching the letter — that builds confidence. If the wording feels dense, translate it into everyday language first, then map that plain sentence back onto -55 mV. Remember that physiology questions reward precise language: name the process, the location, and the outcome, then match that to the option text.