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#action potential

10 public questions tagged with this topic.

Membrane Transportation

Which ion channel is involved in action potential generation?

Action potential propagation in excitable cells depends on rapid voltage dependent changes in sodium and potassium conductances. Resting potential near minus 70 millivolts maintained by K+ leak and Na+/K+ ATPase. Upon synaptic depolarization reaching threshold about minus 55 millivolts, voltage sensor S4 helices of sodium channels containing repeated Arg-X-X motifs move outward within 100 microseconds, opening activation gate formed by S6 crossing. Sodium electrochemical gradient strong due to 145 millimolar outside, 12 millimolar inside and negative membrane potential drives inward current, d

Ref: Alberts et al., Molecular Biology of the Cell, Chapter 11: Voltage-Gated Na+ Channels in Action Potentials.

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Action potential

Receptor potential differs from action potential because it:

Pick B: Is graded. Thinking about Action potential in a practical way — what the structure does, or what the process achieves — leads you here. Clinically and academically, the same logic shows up again and again: cause and effect line up with Is graded — that is the mechanism or reason the stem is pointing to. Hence Is graded is correct. Treat this as a building block for the rest of Action potential; neighbouring topics often reuse the same principle. Keep a one-line summary card for this idea and revisit it before the paper; short, repeated review beats long cramming sessions. If the wordin

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.

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