Class 6/Question Bank
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Questions on The Digestive System
Subject: Biology
Topic: Digestive System
Total Marks: 350
Time: 3 Hours
Instructions: Choose the correct answer from the given options.
The digestive system is primarily responsible for: a) Circulation of blood b) Breaking down food into smaller molecules c) Gas exchange d) Waste filtration
Which enzyme in saliva begins carbohydrate digestion? a) Pepsin b) Lipase c) Amylase d) Trypsin
The wave-like muscular contractions that move food through the esophagus are called: a) Peristalsis b) Churning c) Segmentation d) Mastication
Gastric juices contain: a) Only hydrochloric acid b) Only pepsin c) Hydrochloric acid and pepsin d) Bile and amylase
The semi-liquid paste formed in the stomach is called: a) Bolus b) Chyme c) Feces d) Bile
The primary site for nutrient absorption is: a) Stomach b) Large intestine c) Small intestine d) Mouth
Which organ produces bile? a) Pancreas b) Liver c) Gallbladder d) Stomach
Pepsin is activated by: a) Bile b) Pancreatic juice c) Hydrochloric acid d) Saliva
The function of the large intestine is primarily: a) Protein digestion b) Fat emulsification c) Water and electrolyte absorption d) Carbohydrate breakdown
Feces are stored in the: a) Rectum b) Anus c) Large intestine d) Small intestine
Which enzyme breaks down proteins in the stomach? a) Amylase b) Pepsin c) Lipase d) Trypsin
The gallbladder stores: a) Pancreatic juice b) Gastric juice c) Bile d) Saliva
Mechanical digestion in the mouth involves: a) Enzyme action b) Acid secretion c) Chewing d) Peristalsis
The pharynx serves as a passageway between: a) Stomach and small intestine b) Mouth and esophagus c) Small and large intestine d) Esophagus and stomach
Pancreatic amylase acts on: a) Proteins b) Fats c) Carbohydrates d) Vitamins
The enzyme maltase breaks down: a) Proteins b) Fats c) Maltose d) Starch
Fatty acids and glycerol are the end products of: a) Protein digestion b) Carbohydrate digestion c) Fat digestion d) Nucleic acid digestion
Trypsin is a: a) Carbohydrase b) Protease c) Lipase d) Amylase
The opening through which feces are expelled is: a) Rectum b) Anus c) Large intestine d) Small intestine
Sucrase enzyme breaks down: a) Starch b) Sucrose c) Lactose d) Maltose
The stomach churns food to form: a) Bolus b) Chyme c) Feces d) Bile
Which of the following is NOT a function of the mouth? a) Ingestion b) Mechanical digestion c) Chemical digestion d) Absorption
Pancreatic lipase requires which substance for optimal function? a) HCl b) Bile c) Pepsin d) Amylase
The small intestine receives digestive juices from: a) Liver only b) Pancreas only c) Both liver and pancreas d) Stomach only
Lactase enzyme is responsible for digesting: a) Milk proteins b) Milk sugar c) Milk fats d) Milk vitamins
The esophagus is also known as: a) Wind pipe b) Food pipe c) Bile duct d) Pancreatic duct
Protein digestion begins in the: a) Mouth b) Stomach c) Small intestine d) Large intestine
The end products of protein digestion are: a) Fatty acids b) Glucose c) Amino acids d) Glycerol
Bile helps in: a) Protein digestion b) Carbohydrate digestion c) Fat emulsification d) Water absorption
The muscular contractions in the esophagus move food: a) Upward b) Downward c) Sideways d) In circles
Which organ stores and concentrates bile? a) Liver b) Pancreas c) Gallbladder d) Stomach
Hydrochloric acid in the stomach: a) Activates pepsin only b) Kills bacteria only c) Both activates pepsin and kills bacteria d) Neutralizes food
The breakdown of large fat globules into smaller ones is called: a) Digestion b) Absorption c) Emulsification d) Secretion
Intestinal peptidases act on: a) Proteins b) Polypeptides c) Amino acids d) Carbohydrates
The primary function of the rectum is: a) Digestion b) Absorption c) Storage of feces d) Secretion
Salivary amylase works optimally in: a) Acidic medium b) Basic medium c) Neutral medium d) Any medium
The stomach wall secretes: a) Bile b) Pancreatic juice c) Gastric juice d) Intestinal juice
Which enzyme is NOT produced by the pancreas? a) Amylase b) Lipase c) Trypsin d) Pepsin
The final products of carbohydrate digestion include: a) Amino acids b) Fatty acids c) Monosaccharides d) Polypeptides
Food moves from the pharynx to the: a) Stomach b) Esophagus c) Small intestine d) Large intestine
The large intestine is primarily involved in: a) Chemical digestion b) Mechanical digestion c) Water absorption d) Enzyme production
Pepsin functions optimally in: a) Acidic conditions b) Basic conditions c) Neutral conditions d) Any conditions
The pancreas produces: a) Only enzymes b) Only hormones c) Both enzymes and hormones d) Only bile
Starch digestion begins in the: a) Stomach b) Mouth c) Small intestine d) Large intestine
The enzyme responsible for fat digestion is: a) Amylase b) Pepsin c) Lipase d) Maltase
Gastric juice is produced by: a) Liver b) Pancreas c) Stomach d) Small intestine
The absorption of nutrients primarily occurs in: a) Stomach b) Small intestine c) Large intestine d) Mouth
Which of the following is a monosaccharide? a) Starch b) Sucrose c) Glucose d) Lactose
The anus is controlled by: a) Voluntary muscles only b) Involuntary muscles only c) Both voluntary and involuntary muscles d) No muscles
Carbohydrate digestion is completed in the: a) Mouth b) Stomach c) Small intestine d) Large intestine
The liver produces approximately how much bile per day? a) 100-200 ml b) 500-1000 ml c) 1500-2000 ml d) 2500-3000 ml
Which digestive enzyme has the highest pH optimum? a) Pepsin b) Pancreatic amylase c) Salivary amylase d) Lipase
The villi are found in: a) Stomach b) Small intestine c) Large intestine d) Esophagus
Intrinsic factor is produced by: a) Pancreas b) Liver c) Stomach d) Small intestine
The hormone gastrin is produced in: a) Pancreas b) Liver c) Stomach d) Small intestine
Cellulose cannot be digested by humans because: a) It's too hard b) We lack cellulase enzyme c) It's toxic d) It dissolves too quickly
The brush border is found in: a) Stomach b) Small intestine c) Large intestine d) Esophagus
Vitamin B12 absorption requires: a) Bile salts b) Intrinsic factor c) Pepsin d) Amylase
The cecum is part of: a) Small intestine b) Large intestine c) Stomach d) Pancreas
Lactose intolerance is due to deficiency of: a) Amylase b) Lipase c) Lactase d) Pepsin
The appendix is attached to: a) Stomach b) Small intestine c) Cecum d) Rectum
Gastroesophageal reflux is caused by: a) Too much acid production b) Failure of lower esophageal sphincter c) Bacterial infection d) Enzyme deficiency
The pyloric sphincter controls movement between: a) Esophagus and stomach b) Stomach and small intestine c) Small and large intestine d) Rectum and anus
Zymogen granules contain: a) Active enzymes b) Inactive enzyme precursors c) Hormones d) Vitamins
The enterokinase enzyme is produced by: a) Pancreas b) Liver c) Small intestine d) Stomach
Cholecystokinin (CCK) stimulates: a) Gastric acid secretion b) Pancreatic enzyme secretion c) Salivary secretion d) Bile production
The ileocecal valve prevents: a) Forward movement of food b) Backward movement of contents c) Acid reflux d) Enzyme inactivation
Pepsinogen is converted to pepsin by: a) Bile b) HCl c) Trypsin d) Amylase
The migrating motor complex occurs during: a) Feeding b) Fasting c) Sleeping d) Exercise
Gastric lipase is most active in: a) Alkaline medium b) Neutral medium c) Acidic medium d) Any medium
The hepatopancreatic ampulla is also called: a) Ampulla of Vater b) Sphincter of Oddi c) Pyloric antrum d) Cardiac sphincter
Secretin hormone stimulates: a) Gastric acid secretion b) Pancreatic bicarbonate secretion c) Bile production d) Salivary secretion
The parietal cells secrete: a) Pepsinogen b) HCl and intrinsic factor c) Mucus d) Gastrin
Trypsinogen is activated by: a) HCl b) Pepsin c) Enterokinase d) Bile
The chief cells secrete: a) HCl b) Pepsinogen c) Mucus d) Gastrin
Micelles are formed by: a) Proteins b) Carbohydrates c) Bile salts and lipids d) Vitamins
The haustra are found in: a) Small intestine b) Large intestine c) Stomach d) Esophagus
Vitamin K is produced by bacteria in: a) Stomach b) Small intestine c) Large intestine d) Mouth
The gastrocolic reflex stimulates: a) Gastric emptying b) Colonic motility c) Pancreatic secretion d) Bile release
Chylomicrons transport: a) Proteins b) Carbohydrates c) Lipids d) Vitamins
The myenteric plexus controls: a) Secretion b) Motility c) Absorption d) Blood flow
Gastric inhibitory peptide (GIP) is released by: a) Stomach b) Pancreas c) Small intestine d) Large intestine
The muscularis externa has how many layers? a) One b) Two c) Three d) Four
Brunner's glands are found in: a) Stomach b) Duodenum c) Jejunum d) Ileum
The hormone motilin stimulates: a) Gastric acid secretion b) Intestinal motility c) Pancreatic secretion d) Bile release
Peyer's patches are found in: a) Stomach b) Small intestine c) Large intestine d) Pancreas
The anal sphincters are: a) Both voluntary b) Both involuntary c) Internal involuntary, external voluntary d) Internal voluntary, external involuntary
Segmentation movements help in: a) Propulsion only b) Mixing only c) Both mixing and propulsion d) Neither mixing nor propulsion
The mesentery supports: a) Stomach b) Small intestine c) Large intestine d) Liver
Crypts of Lieberkühn are found in: a) Stomach b) Small intestine c) Large intestine d) Pancreas
The vagus nerve stimulates: a) Gastric secretion b) Pancreatic secretion c) Bile release d) All of the above
Cholesterol is converted to bile acids in: a) Pancreas b) Liver c) Gallbladder d) Small intestine
The enterohepatic circulation involves: a) Proteins b) Carbohydrates c) Bile salts d) Vitamins
Pancreatic polypeptide is secreted by: a) Alpha cells b) Beta cells c) Delta cells d) PP cells
The cephalic phase of gastric secretion is mediated by: a) Hormones b) Neural pathways c) Local reflexes d) Mechanical stimuli
Zollinger-Ellison syndrome involves excessive secretion of: a) Insulin b) Gastrin c) Secretin d) CCK
The gastric phase of digestion is triggered by: a) Sight of food b) Smell of food c) Food entering stomach d) Food entering small intestine
Pancreatic juice contains: a) Only enzymes b) Only bicarbonate c) Both enzymes and bicarbonate d) Only water
The intestinal phase of gastric secretion: a) Stimulates gastric secretion b) Inhibits gastric secretion c) Has no effect d) Varies with food type
The most important factor for fat absorption is: a) Pancreatic lipase b) Bile salts c) Gastric lipase d) Intestinal motility
Instructions: Write brief answers in one or two sentences.
Instructions: Write detailed answers in 3-4 sentences.
Instructions: Write comprehensive answers with proper explanations, examples, and diagrams where necessary.
Describe in detail the complete journey of food through the digestive system, highlighting the major processes occurring at each stage.
Explain the comprehensive process of protein digestion, including all enzymes involved, their sources, activation mechanisms, and end products.
Discuss the structure and functions of the liver in detail, emphasizing its role in digestion, metabolism, and detoxification.
Describe the hormonal regulation of digestion, including the major digestive hormones, their sources, targets, and functions.
Explain the detailed mechanism of fat digestion and absorption, including the role of bile, pancreatic lipase, and the formation of micelles and chylomicrons.
Discuss the structure and function of the pancreas, including both its exocrine and endocrine functions in relation to digestion.
Describe the detailed anatomy and physiology of the small intestine, emphasizing its adaptations for maximum absorption.
Explain the neural control of digestion, including the role of the enteric nervous system, vagus nerve, and various reflexes.
Discuss the process of carbohydrate digestion in detail, from complex polysaccharides to monosaccharide absorption.
Describe the structure and function of the stomach, including gastric secretions, their regulation, and protective mechanisms.
Explain the process of defecation, including the anatomy involved, neural control, and the defecation reflex.
Discuss the role of the large intestine in digestion, including water absorption, electrolyte balance, and the gut microbiome.
Describe the pathophysiology of common digestive disorders such as peptic ulcers, gastroesophageal reflux disease, and inflammatory bowel disease.
Explain the coordination between digestion and metabolism, including how digestive products enter metabolic pathways.
Discuss the adaptations of the digestive system to different dietary requirements and nutritional states.
Describe the development and regeneration of the digestive system, including stem cell populations and tissue renewal.
Explain the immune functions of the digestive system, including gut-associated lymphoid tissue (GALT) and mucosal immunity.
Discuss the relationship between the digestive system and other body systems, including circulatory, nervous, and endocrine systems.
Describe the molecular mechanisms of nutrient absorption, including transport proteins, carrier systems, and cellular uptake mechanisms.
Explain the regulation of digestive enzyme secretion and activation, including zymogen activation and feedback mechanisms.
Discuss the role of the digestive system in maintaining homeostasis, including pH regulation, fluid balance, and nutrient storage.
Describe the evolutionary adaptations of the human digestive system compared to other mammals and dietary specialists.
Explain the pharmacological aspects of digestion, including how drugs affect digestive processes and drug absorption through the GI tract.
Discuss the diagnostic methods used to assess digestive system function and common laboratory tests for digestive disorders.
Describe the surgical interventions commonly performed on the digestive system and their physiological consequences.
Journey of Food: Food begins its journey in the mouth, where chewing (mechanical digestion) and salivary amylase (chemical digestion of carbs) create a bolus. The bolus is swallowed, passing through the pharynx and esophagus via peristalsis. In the stomach, food is mixed with gastric juice (HCl and pepsin), beginning protein digestion and forming chyme. The chyme is slowly released into the small intestine, the primary site for digestion and absorption. Here, bile from the liver and enzymes from the pancreas break down fats, proteins, and carbohydrates, and the resulting nutrients are absorbed through the intestinal walls. The remaining indigestible material moves to the large intestine, where water is absorbed and feces are formed. Finally, feces are stored in the rectum and eliminated through the anus.
Protein Digestion: The digestion of protein begins in the stomach. The acidic environment (due to HCl) denatures proteins and activates pepsinogen into its active form, pepsin. Pepsin breaks down large protein molecules into smaller polypeptides. When the chyme enters the small intestine, the pancreas releases inactive proteases (zymogens) like trypsinogen. The intestinal enzyme enterokinase activates trypsinogen to trypsin. Trypsin then activates other pancreatic proteases, such as chymotrypsin, and also continues to break down polypeptides. Finally, peptidases on the brush border of the intestinal cells break down the remaining small polypeptides into single amino acids, which are then absorbed into the bloodstream.
Liver Structure and Functions: The liver, the largest internal organ, is located in the upper right quadrant of the abdomen. Its digestive function is to produce bile, an alkaline fluid containing bile salts, which emulsifies fats in the small intestine, aiding their digestion. Beyond digestion, the liver has critical metabolic functions: it processes absorbed nutrients, stores glucose as glycogen, synthesizes plasma proteins, and metabolizes fats and proteins. It also serves as a primary site for detoxification, breaking down harmful substances like alcohol and drugs, and converting toxic ammonia into urea for excretion.
Hormonal Regulation of Digestion: Digestion is regulated by several key hormones. Gastrin, produced by the stomach, is released in response to food presence and stimulates the secretion of gastric acid. When acidic chyme enters the duodenum, the small intestine releases secretin, which stimulates the pancreas to secrete bicarbonate to neutralize the acid. The presence of fats and proteins in the duodenum triggers the release of cholecystokinin (CCK), which stimulates the pancreas to release digestive enzymes and the gallbladder to contract and release bile. These hormones work in a coordinated fashion to ensure enzymes and bile are present when needed.
Fat Digestion and Absorption: Fat digestion occurs almost entirely in the small intestine. First, large fat globules are emulsified by bile salts (from the liver) into smaller droplets, increasing the surface area for enzymes. Pancreatic lipase, an enzyme from the pancreas, then breaks down these fat droplets into fatty acids and glycerol. These products, along with bile salts, form tiny spherical structures called micelles, which transport the fats to the surface of the intestinal cells. The fatty acids and glycerol diffuse into the cells, where they are reassembled into triglycerides and packaged into larger particles called chylomicrons. These chylomicrons are then absorbed into the lymphatic system via lacteals before entering the bloodstream.
Pancreas Structure and Function: The pancreas is a gland located behind the stomach that has both exocrine and endocrine functions. Its exocrine function is crucial for digestion; it produces pancreatic juice, which contains a mixture of digestive enzymes (amylase, lipase, proteases) and bicarbonate. This juice is secreted into the small intestine to neutralize stomach acid and digest all major food types. Its endocrine function involves the islets of Langerhans, which secrete hormones directly into the bloodstream. These include insulin and glucagon, which are essential for regulating blood glucose levels.
Small Intestine Anatomy and Physiology: The small intestine is a long, coiled tube divided into the duodenum, jejunum, and ileum. Its primary function is nutrient absorption, and its structure is highly adapted for this purpose. The inner wall is folded into circular folds (plicae circulares), which are covered in finger-like projections called villi. The cells on the surface of the villi have even smaller projections called microvilli (forming the brush border). These three levels of folding increase the surface area for absorption by over 600 times, ensuring efficient uptake of nutrients into the blood and lymph.
Neural Control of Digestion: The digestive system is controlled by the enteric nervous system (ENS), often called the "second brain," which can operate independently to control local reflexes for motility and secretion. The ENS is also influenced by the autonomic nervous system. The parasympathetic nervous system (primarily via the vagus nerve) generally stimulates digestion ("rest and digest"), increasing secretion and motility. The sympathetic nervous system ("fight or flight") inhibits digestion. Reflexes like the gastrocolic reflex (food in the stomach stimulates colonic motility) are mediated by this neural network.
Carbohydrate Digestion: The digestion of complex carbohydrates (starch) begins in the mouth with the enzyme salivary amylase. This action stops in the acidic environment of the stomach. In the small intestine, pancreatic amylase continues to break down starch and glycogen into smaller oligosaccharides and disaccharides. The final stage of digestion occurs at the brush border of the small intestine, where enzymes like maltase, sucrase, and lactase break down disaccharides (maltose, sucrose, lactose) into their constituent monosaccharides (glucose, fructose, galactose). These simple sugars are then absorbed across the intestinal wall into the bloodstream.
Stomach Structure and Function: The stomach is a J-shaped muscular organ with four main regions. It acts as a temporary storage tank for food and is a major site for mechanical and chemical digestion. Its muscular walls perform powerful churning motions to mix food with gastric juice. This juice, secreted by gastric glands, contains hydrochloric acid (HCl) to kill microbes and activate enzymes, and pepsinogen, which is converted to pepsin to begin protein digestion. To protect itself from the harsh acidic environment, the stomach lining is coated with a thick, bicarbonate-rich mucus layer.
Process of Defecation: Defecation is the elimination of feces from the body. The process is initiated by the defecation reflex, which occurs when mass movements in the colon push feces into the normally empty rectum, stretching its walls. This stretching triggers a parasympathetic spinal reflex, causing the sigmoid colon and rectum to contract and the internal anal sphincter (involuntary muscle) to relax. The brain also receives a signal, giving the conscious awareness of the need to defecate. The external anal sphincter is under voluntary control, allowing defecation to be postponed until an appropriate time.
Large Intestine and Gut Microbiome: The large intestine's primary roles are to absorb water and electrolytes from indigestible food matter and to form and store feces. It does not produce digestive enzymes. It is also home to the gut microbiome, a complex community of trillions of bacteria. These bacteria play a symbiotic role by fermenting undigested carbohydrates, producing important nutrients like vitamin K and certain B vitamins, and preventing the growth of pathogenic microbes.
Pathophysiology of Digestive Disorders:
Digestion and Metabolism Coordination: The digestive system breaks down food into absorbable nutrients, which are then used in metabolic pathways. For example, glucose absorbed from carbohydrate digestion enters the bloodstream and is used in cellular respiration to produce ATP. Amino acids from protein digestion are used to synthesize new proteins. Fatty acids are used for energy or stored. Hormones like insulin are crucial for this coordination, promoting the uptake and storage of glucose after a meal.
Digestive System Adaptations: The human digestive system is omnivorous, but it can adapt to different diets. For example, the secretion of digestive enzymes can be adjusted based on the macronutrient content of the diet. The composition of the gut microbiome is also highly adaptable and can change significantly based on long-term dietary patterns, influencing how different foods, especially fiber, are processed and the range of nutrients that can be extracted.
Digestive System Development and Regeneration: The digestive tract lining is one of the most rapidly regenerating tissues in the body, with a complete turnover every few days. This is accomplished by intestinal stem cells located at the base of the crypts of Lieberkühn. These stem cells continuously divide to produce new cells that migrate up the villi, differentiating into absorptive cells, goblet cells, and other specialized cell types, ensuring the integrity and function of the intestinal barrier.
Immune Functions of the Digestive System: The digestive system is a major immunological organ. It contains a large amount of Gut-Associated Lymphoid Tissue (GALT), including Peyer's patches in the ileum. This system constantly samples gut contents to distinguish between harmless food antigens, beneficial commensal bacteria, and harmful pathogens. It mounts an immune response against pathogens while maintaining tolerance to non-harmful substances, a critical function for overall health.
Digestive System and Other Body Systems: The digestive system is intricately linked with other systems. The circulatory system transports absorbed nutrients from the gut to the rest of the body. The nervous system (both central and enteric) regulates digestive motility and secretion. The endocrine system coordinates digestion through hormones and is also influenced by it (e.g., gut hormones affecting appetite and insulin release).
Molecular Mechanisms of Nutrient Absorption: Nutrient absorption is a highly specific process. Monosaccharides like glucose are absorbed via secondary active transport with sodium ions (SGLT1) and facilitated diffusion (GLUT2). Amino acids are also absorbed by various active transport mechanisms. Fatty acids and monoglycerides diffuse into intestinal cells, while water is absorbed by osmosis, following the osmotic gradient created by the absorption of solutes.
Regulation of Digestive Enzyme Secretion: Most digestive enzymes are stored and secreted as inactive precursors called zymogens (e.g., pepsinogen, trypsinogen) to prevent them from digesting the cells that produce them. Activation occurs only in the lumen of the GI tract where they are needed. For example, pepsinogen is activated by HCl in the stomach, and trypsinogen is activated by enterokinase in the small intestine. This activation is often a cascade, where one active enzyme activates others, providing a rapid and amplified response.
Digestive System in Homeostasis: The digestive system is vital for maintaining homeostasis. It regulates fluid and electrolyte balance by absorbing water and minerals from the diet. It plays a role in pH regulation through the secretion of bicarbonate by the pancreas to neutralize stomach acid. Most importantly, it provides a constant supply of nutrients to the blood, which is essential for the energy and building blocks required by all body cells to function.
Evolutionary Adaptations: Compared to herbivorous mammals, which have long and complex digestive tracts with fermentation chambers to break down cellulose, the human digestive system is shorter and simpler, reflecting an omnivorous diet. The human gut lacks the enzyme cellulase. However, compared to carnivores, the human small intestine is relatively long, allowing for efficient absorption of nutrients from plant matter.
Pharmacological Aspects of Digestion: Many drugs target the digestive system. For example, proton pump inhibitors (PPIs) reduce the production of stomach acid to treat GERD and ulcers. Laxatives increase gut motility or water content in feces to treat constipation. The GI tract is also a major site for the absorption of most orally administered drugs, and factors like stomach pH and food presence can significantly affect how well a drug is absorbed.
Diagnostic Methods for Digestive System: Digestive function is assessed using various methods. Endoscopy (upper GI) and colonoscopy (lower GI) involve using a flexible camera to visualize the lining of the digestive tract and take biopsies. Barium swallows or enemas use a contrast agent to visualize the GI tract on X-rays. Stool samples can be analyzed for blood, fat, or pathogens, and blood tests can check for liver enzymes or markers of inflammation.
Surgical Interventions on the Digestive System: Common surgical interventions include appendectomy (removal of the appendix), cholecystectomy (removal of the gallbladder), and colectomy (removal of all or part of the colon), often for cancer or IBD. Bariatric surgery (e.g., gastric bypass) alters the stomach and small intestine to induce weight loss. These surgeries can have significant physiological consequences, such as altered nutrient absorption (malabsorption) or changes in bowel habits.
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