Gastrointestinal Physiology · NEET PG Preparation Physiology
During the interdigestive period, the gastrointestinal tract exhibits cyclical motor activity known as the Migrating Motor Complex (MMC). Which of th…
Practice question from Gastrointestinal Physiology (NEET PG Preparation Physiology), with the correct answer and a step-by-step solution.
hard · MCQ · Q-E40719
During the interdigestive period, the gastrointestinal tract exhibits cyclical motor activity known as the Migrating Motor Complex (MMC). Which of the following phases of the MMC is characterized by the highest frequency of action potentials and intense, regular peristaltic contractions propagating down the small intestine?
- A.Phase I
- B.Phase II
- C.Phase IIICorrect answer
- D.Phase IV
Solution
The Migrating Motor Complex has four phases: Phase I is a period of quiescence with no contractions; Phase II has irregular, intermittent contractions; Phase III is the period of intense, peak electrical and mechanical activity (housekeeper wave) with the highest frequency of action potentials; and Phase IV is a short transition period back to quiescence.
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