Smooth and Cardiac Muscle Mechanics
- Previous year questions on Smooth and Cardiac Muscle Mechanics for NEET PG (National Eligibility cum Entrance Test - Postgraduate), from the Physiology section of the exam.
- Most questions here come from previous-year papers of Indian postgraduate medical entrance and licensing exams; where a paper and year are recorded the question carries them. The image-based questions are original vignettes written around an openly licensed figure, and were never asked in any exam.
- 3 live questions in Smooth and Cardiac Muscle Mechanics.
- 1 of 3 questions carries a verified exam year: 2018.
- Physiology is worth about 17 of 300 questions on the exam. See every subject’s weightage.
- Question set last updated 19 Aug 2026.
Q1.The mechanism responsible for sustained vascular smooth muscle contraction is
- ASustained calcium release from SERCA pump
- BVascular smooth muscle tone
- CLatch bridge mechanism✓ Correct answer
- DHenneman principle
Q2.A single cell within a culture of freshly isolated cardiac muscle cells is injected with a fluorescent dye that cannot cross cell membranes. Within minutes, several adjacent cells become fluorescent. The most likely explanation for this observation is the presence of
- AGap junctions✓ Correct answer
- BIP3 receptors
- CTransverse tubules
- DDesmosomes
Q3.Heart muscle, true are all except:
- AAct as syncitium
- BHas multiple nuclei✓ Correct answer
- CHas gap junctions
- DHas branching
Answer key
Q1: C. Latch bridge mechanism; Q2: A. Gap junctions; Q3: B. Has multiple nuclei.
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