Repolarization of action potential mainly results from:
Answer: C) Opening of voltage-gated K+ channels. For Action potential, once you lock onto the key mechanism or definition, Opening of voltage-gated K+ channels is the clear fit. If you restate the concept in your own words, the functional job described in the stem is exactly what Opening of voltage-gated K+ channels does in Action potential. So Opening of voltage-gated K+ channels is the clean, accurate selection. If a similar stem appears later, start from the same core fact and you will land on the same kind of answer. In class notes, highlight this same phrase next to the related diagram so the wording and the picture reinforce each other.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.