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#cardiac electrophysiology question

2 public questions tagged with this topic.

Cardiovascular System: Heart

Which ion channel is absent in nodal cells?

Answer: C) Fast Na+ channel. For Cardiovascular System: Heart, once you lock onto the key mechanism or definition, Fast Na+ channel is the clear fit. If you restate the concept in your own words, excitable-cell physiology turns on membranes, ions, and signalling steps, and Fast Na+ channel captures the correct piece of that story. So Fast Na+ channel 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.

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Cardiovascular System: Heart

Nodal cell depolarization is mainly due to influx of:

Correct option is C, Ca2+. In Cardiovascular System: Heart, the accurate description is Ca2+, and that is what you should commit to memory. Keep the definition tight and the role clear — the functional job described in the stem is exactly what Ca2+ does in Cardiovascular System: Heart. Then Ca2+ 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 Ca2+. Remember that physiology questions reward precise language: name the process, the location, and the outcome, then match that to the option text.

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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