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Understanding GIT Hormones for Exams

Apr 23, 2025

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Lecture Notes: GIT Hormones in Physiology

Objective

  • Discuss the topic of GIT hormones in physiology, focusing on simplifying and memorizing the complicated table of GIT hormones.
  • The lecture forms part of a new timetable starting today for NEET PG, INICET, and FMG.

Key Concepts

  • Topic Type: BBD (Bonafide But Difficult), meaning it requires multiple revisions.
  • Study Method: Use of mnemonics and conceptual understanding to remember GIT hormones.
  • Upcoming session on muscle physiology at 8 PM is part of the continued learning effort.

GIT Hormones Overview

Important Hormones

  • Gastrin: Stimulates everything (gastric/intestinal motility, acid secretion, mucosal growth)
    • Remember: "Gastrin is all Stimulatory (GAST)"
  • Cholecystokinin (CCK): Stimulates intestinal motility, inhibits gastric motility, stimulates gallbladder contraction.
    • Remember: "CCK is for I (intestinal motility)"
  • Secretin: Inhibits gastric motility and secretion, stimulates pancreatic bicarbonate secretion.
    • Remember: "Secretin – Stomach May Everything Inhibited (SEIN)"
  • GIP (Glucose-dependent Insulinotropic Peptide): Stimulates insulin release, inhibited by fatty acids, amino acids and glucose.
    • Remember: "GIP is stimulated by all (food types)"
  • Motilin: Stimulates gastric and intestinal motility.

Cellular Origins of Hormones

  • S Cells: Secrete Secretin
  • I Cells: Secrete CCK
  • K Cells: Secrete GIP
  • G Cells: Secrete Gastrin

Important Tables and Mnemonics

Hormones and Their Actions

  • Gastrin: Stimulates gastric acid secretion, gastric/intestinal motility.
  • CCK: Stimulates gallbladder contraction and pancreatic enzyme secretion.
  • Secretin: Stimulates pancreatic bicarbonate; inhibits gastric emptying.
  • GIP: Increases insulin secretion.
  • Motilin: Stimulates motility.

GIT Hormones Function Summary

  • Gastrin: Acid secretion and mucosal growth.
  • Secretin: Bicarbonate secretion (pancreatic).
  • CCK: Gallbladder and pancreatic enzyme secretion.
  • GIP: Insulinotropic effect.

Practice MCQs

  • Identify hormone actions based on stimuli (e.g., what stimulates secretin or inhibits gastric motility).
  • Understand hormone secretion sites (e.g., gastrin from G cells in the antrum).
  • Apply mnemonics to remember hormone functions and interactions.

Platforms and Resources

  • Unacademy: Free live class at 8 PM focusing on muscle physiology.
  • Telegram Group: Links for session PDFs and communication.
  • Instagram: Daily posts for revision.

Conclusion

  • Simplifying complex topics with mnemonics and concept-based learning.
  • Encouragement to keep studying and revising effectively.

These notes should serve as a concise summary of today's lecture on GIT hormones, helping you keep track of essential details and mnemonics for better retention.

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