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MODULE 17:
THE DIGESTIVE SYSTEM
PART 3 OF 7
Stina has chronic heartburn and was treated for years with acid-suppressing drugs – a reminder that the upper tract has its own everyday problems, separate from her attacks.
Slide 1 Transcript
PATIENT CHART
STINA
THIS PART
Age 45
PRESENTING WITH
Heartburn, bloating, weight loss
DIAGNOSIS
Recurrent Peritonitis and Gut Amyloidosis
CHART CLUES
COLLECTED AS YOU GO
Recurrent Sterile Attacks
Whole-Abdomen, Fever-Plus, Infection-Negative Attacks
Chronic Heartburn
Malabsorptive Symptoms
Persistently Elevated SAA and Rising Cholesterol
Biopsy-Proven Gut Amyloid
Recurrent Peritonitis and Gut Amyloidosis
Put your money down: Stina’s chronic heartburn was treated for years — is that part of her attacks, or something else entirely?
The upper tract has its own common complaints, and Stina has one: chronic heartburn, managed for years with acid-suppressing drugs. Before the videos, predict whether her heartburn belongs to the same mystery as her fever-and-pain attacks, or is an ordinary problem of a different part of the tube.
Pick the answer you believe now. We’ll come back to it later!
An Everyday TroubleAn Everyday Trouble
Digestion begins before the first swallow. In the mouthThe opening of the digestive tract where food enters and mastication begins., teeth shear and grind food into smaller pieces – mechanical digestion – while the salivary glands flood it with saliva, whose enzyme amylase starts breaking down starch and whose mucus binds the result into a slippery bolusA rounded mass of food mixed with saliva that is ready for swallowing.. The tongue pushes that bolus to the pharynxThe muscular passageway connecting the mouth to the esophagus and larynx., and swallowing becomes briefly involuntary: the epiglottisA flap of cartilage that covers the trachea during swallowing to prevent food from entering the airw folds down over the larynxThe voice box; contains vocal cords and connects the pharynx to the trachea. so food takes the correct fork into the esophagusThe muscular tube that transports food from the pharynx to the stomach via peristalsis. rather than the airway. The esophagus then delivers it to the stomach not by gravity but by peristalsis Rhythmic contractions of smooth muscle that move food through the digestive tract. – which is why a person lying flat, or an astronaut, still swallows successfully.
The Oral Cavity
A smaller room than you think.
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A smaller room than you think.
Palate, Tongue & Teeth
The roof, and the tools that tear.
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Drag the Words: Match each term to its role in palate, Tongue & Teeth.
The Entryway and the Descent
The stomach is a muscular bag that mixes and marinates. Gastric pits in its lining release hydrochloric acidA substance that releases hydrogen ions (H⁺) in solution., bringing the contents to a pHA measure of hydrogen ion concentration in a solution. near 2, and the enzyme pepsin, which begins dismantling proteinsLarge molecules made of amino acids with various functions in the body.; the churning produces a soupy mixture called chymeA semi-fluid mixture of partially digested food and digestive juices that moves from the stomach int. A thick layer of mucus and bicarbonate(HCO₃⁻) – A crucial buffer in blood that helps maintain pH balance; formed when carbon dioxide react normally shields the stomach’s own wall from this acid. When that defense is overwhelmed – by reflux of acid up into the esophagus, or by the bacterium Helicobacter pylori or NSAIDs eroding the lining – the result is heartburn or a peptic ulcer. Stina’s chronic heartburn belongs to this everyday category of upper-GI trouble; importantly, it is not the source of her attacks, and learning to separate the two is part of reading her chart correctly.
The Salivary Glands
Three pairs, pouring into the mouth.
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Fill in the Blanks: Complete the key terms for the Salivary Glands.
The Pharynx
The crossroads of food and air.
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Mark the Words: Mark the words that describe the Pharynx.
A Separate Problem
For Stina, the upper tract is mostly a reminder to keep the threads separate. The mouth, pharynx, and esophagus have their own everyday troubles — and hers is chronic heartburn, an upper-tract problem tied to the lower esophageal sphincter and the esophageal hiatus, treated for years with acid-suppressing drugs. It has nothing to do with the serositis attacks lower down. Building the entryway and the descent — the oral cavity, the salivary glands, the pharynx guarded by the epiglottis, the esophagus piercing the diaphragm — keeps her ordinary heartburn cleanly distinct from the extraordinary fire in her peritoneumThe membrane lining the abdominal cavity and organs..
The Epiglottis
The flap that guards the wrong pipe.
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Multiple Choice: Choose the best answer about the Epiglottis.
The Esophagus
A collapsible tube through the diaphragm.
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Sort the Paragraphs: Put the steps of the Esophagus in the right order.
Swallowing
Two muscle layers, pushing in turn.
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Dialog Cards: Flip the cards to review swallowing.
Entryway, Crossroads, Descent
From the mouth to the top of the stomach.
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Summary: Pick the true statement about entryway, Crossroads, Descent.
The J-Shaped Bag
A stretchy storage sac for what you swallow.
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Drag and Drop: Drag each label onto the J-Shaped Bag.
Regions of the Stomach
Four named areas, top to bottom.
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Image Hotspots: Tap the labelled parts of regions of the Stomach.
Curvatures & Omenta
The bag’s edges, hung with fatty sheets.
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Single Choice: Which statement about curvatures & Omenta is correct?
Rugae
The folds that vanish as you eat.
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Drag the Words: Match each term to its role in rugaeFolds in the stomach lining that allow expansion when food enters..
Three Muscle Layers
The stomach breaks the two-layer rule.
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Fill in the Blanks: Complete the key terms for three Muscle Layers.
Gastric Pits & Glands
Wells in the lining, glands beneath.
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Mark the Words: Mark the words that describe gastric Pits & Glands.
The Pyloric Sphincter
The guarded exit to the small intestine.
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Multiple Choice: Choose the best answer about the Pyloric Sphincter.
A Muscular Storage Bag
PlaJ-shaped, folded, three-layered, and guarded.eholder
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Sort the Paragraphs: Put the steps of A Muscular Storage Bag in the right order.
FINDING!
Chronic Heartburn — an Upper-Tract Problem, Separate from the Attacks
The sign to log is a distinct, everyday complaint: chronic heartburn treated for years with acid-suppressing drugs, an upper-tract problem localized to the esophagus and lower esophageal sphincter (where the esophagus passes through the diaphragm at the esophageal hiatus). It is anatomically and clinically separate from the whole-abdomen serositis attacks. Chart entry: chronic reflux/heartburn of the upper tract — a separate, ordinary problem, not part of the serositis story.
Confirm or refute your bet: Stina’s chronic heartburn was treated for years — is that part of her attacks, or something else entirely?
Her heartburn is something else entirely. It’s an ordinary upper-tract problem — reflux across the lower esophageal sphincter — belonging to the mouth-to-stomach descent we just built, not to the serositis attacks that inflame her whole abdomen. Keeping the two apart matters, because a decade of attacks got muddied by exactly this kind of overlapping everyday complaint.
Slide 8 Transcript
NEXT PART
Chyme leaves the stomach in squirts – and enters the organ where almost all real absorption happens, and where the gut keeps a standing army. Next: the intestines.
QUICK QUESTIONS
QUICK QUESTIONS
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← Familial Mediterranean Fever — case home
All pages for Module 17 — The Digestive System
17.0 Module Overview
17.1 The Attack That Looked Like Appendicitis
17.2 One Long Tube, Four Layers
17.3 Mouth to Stomach: Starting the Breakdown
17.4 The Intestines: Absorption and the Gut’s Immune Watch
17.5 The Liver, Gallbladder, Pancreas & the Hepatic Portal System
17.6 The Serosal Fire and the Silent Deposits
17.7 Amyloid in FMF
17.8 Conclusion and Assessment
17.9 Evidence Behind the Case
All Modules
- Anatomical Language, Membranes & Homeostasis
- Just Enough Chemistry
- The Cell & Its Transport
- Making Cells & Proteins
- The Integumentary System
- The Skeletal System
- The Muscular System
- Nervous Tissue & the Senses
- The Spinal Cord
- The Brain & the Blood–Brain Barrier
- The Autonomic Nervous System
- Special Senses (in developmentThe process of growth and differentiation.)
- The Endocrine System
- Blood
- The Heart
- Blood Vessels
- The Digestive System
- The Respiratory System
- The Urinary System
- Fluids, Electrolytes & Acid–Base Balance
- The Reproductive System
- The Immune System
List of terms
- mouth
- bolus
- pharynx
- epiglottis
- larynx
- esophagus
- peristalsis
- acid
- pH
- proteins
- chyme
- bicarbonate
- peritoneum
- rugae
- development