Digestion and Absorption Practice Exam Quiz Answers

Digestion and Absorption Practice Exam Quiz Answers

Understanding the intricate processes of digestion and absorption is fundamental for anyone studying biology, health sciences, or preparing for standardized exams in nutrition, medicine, or life sciences. This comprehensive practice quiz is expertly designed to test your grasp of how the human body processes and absorbs nutrients from the food we eat.

The quiz takes you deep into the physiology and biochemistry of the digestive system, challenging your knowledge of every key component—from mechanical digestion in the mouth to chemical breakdown in the stomach and nutrient absorption in the small intestine. Each question targets essential learning areas, ensuring you’re not just memorizing facts but truly understanding how the body functions at a cellular and systemic level.

What You’ll Learn and Review

This practice exam focuses on multiple layers of the digestive and absorptive processes, helping you:

• Identify the structure and function of key digestive organs such as the stomach, pancreas, liver, and intestines.
• Understand the enzymatic breakdown of carbohydrates, proteins, and fats, including which enzymes act where and how.
• Trace the path of nutrient absorption through the villi and microvilli of the small intestine.
• Recognize the role of bile in emulsification of fats and its production and release.
• Explore the interaction between the digestive and circulatory systems in nutrient transport.
• Evaluate disorders and dysfunctions such as malabsorption, lactose intolerance, or enzyme deficiencies.

By practicing with this quiz, you will strengthen your ability to apply theoretical knowledge in real-world exam scenarios, making you more confident and prepared.

Why This Practice Quiz Is Effective

Every question is crafted with the dual purpose of reinforcing conceptual clarity and building test-taking skills. The quiz doesn’t just focus on memorizing facts but helps you think critically—a necessary skill for mastering complex topics and succeeding in competitive exams.

Realistic question framing ensures you become familiar with the type and style of questions often seen in exams, while the variety of question formats helps you develop a broader understanding of the content.

Whether you’re preparing for academic assessments, standardized entrance tests, or simply brushing up your biological knowledge, this quiz offers a focused, well-structured, and engaging approach to mastering digestion and absorption.

Who Should Use This Quiz

• Pre-med and nursing students needing thorough biology exam preparation
• Health and nutrition science learners reviewing core digestive concepts
• Biology students revisiting human physiology topics
• Educators looking for high-quality supplementary resources
• Anyone interested in deepening their understanding of how the human body processes food

Whether you’re a student aiming for top grades or a professional brushing up on fundamentals, this quiz provides an effective self-assessment tool to ensure your knowledge is accurate, up to date, and exam-ready.

FAQ

What topics does the digestion and absorption quiz cover?

The quiz covers topics such as digestive system anatomy, enzymatic breakdown of food, absorption mechanisms, roles of digestive organs, nutrient transport, and common digestive disorders.

Is this quiz suitable for exam preparation in nursing or pre-med programs?

Yes, it is designed specifically to support students in health-related fields, offering high-yield content relevant for exams in biology, anatomy, physiology, and nutrition science.

Can I use this quiz for self-study and revision?

Absolutely. It’s ideal for self-paced learning, whether you’re preparing for an upcoming test or just reviewing important biological concepts.

Does this quiz include application-based and conceptual questions?

Yes, it includes a balanced mix of conceptual, factual, and scenario-based questions to test a wide range of understanding.

How does this quiz help improve exam performance?

It enhances your critical thinking, reinforces key concepts, and familiarizes you with exam-style questions, which boosts confidence and accuracy under time pressure.

Questions

Which of the following enzymes is responsible for breaking down proteins in the stomach?
A. Amylase
B. Pepsin
C. Lipase
D. Sucrase

What is the main function of bile in digestion?
A. Emulsify fats
B. Neutralize stomach acids
C. Digest carbohydrates
D. Absorb vitamins

Which of the following structures prevent the reflux of food from the stomach back into the esophagus?
A. Cardiac sphincter
B. Pyloric sphincter
C. Ileocecal valve
D. Anal sphincter

Which of the following is absorbed by the villi in the small intestine?
A. Carbohydrates
B. Proteins
C. Fats
D. All of the above

What substance neutralizes stomach acid in the duodenum?
A. Bile
B. Pancreatic enzymes
C. Bicarbonate ions
D. Insulin

Which enzyme is responsible for breaking down starch into maltose?
A. Amylase
B. Lipase
C. Maltase
D. Sucrase

What is the function of the large intestine?
A. Digestion of proteins
B. Absorption of nutrients
C. Absorption of water and electrolytes
D. Secretion of digestive enzymes

Which of the following structures increases the surface area of the small intestine to aid in absorption?
A. Plicae circulares
B. Villi
C. Microvilli
D. All of the above

What is the role of cholecystokinin (CCK) in digestion?
A. Stimulates gastric acid secretion
B. Stimulates bile release from the gallbladder
C. Stimulates insulin release
D. Stimulates the release of gastric enzymes

Where does the majority of nutrient absorption occur?
A. Stomach
B. Large intestine
C. Small intestine
D. Esophagus

What type of macromolecule is broken down by lipase?
A. Proteins
B. Carbohydrates
C. Fats
D. Nucleic acids

Which of the following organs produces insulin and digestive enzymes?
A. Liver
B. Gallbladder
C. Pancreas
D. Small intestine

What substance does the liver produce to aid in the digestion of fats?
A. Insulin
B. Bile
C. Amylase
D. Pepsin

Which digestive enzyme is responsible for breaking down lactose?
A. Amylase
B. Lactase
C. Maltase
D. Pepsin

Which digestive enzyme is responsible for breaking down triglycerides into fatty acids and glycerol?
A. Amylase
B. Trypsin
C. Lipase
D. Pepsin

What is the role of the stomach’s mucus lining?
A. To absorb nutrients
B. To break down proteins
C. To protect the stomach from digestive acids
D. To neutralize stomach acid

What is the primary function of the duodenum?
A. Absorption of nutrients
B. Breakdown of carbohydrates
C. Digestion and neutralization of stomach acid
D. Storage of bile

Which of the following is a function of the pancreas in digestion?
A. Secretion of bile
B. Secretion of digestive enzymes
C. Absorption of nutrients
D. Breakdown of starch

Which digestive enzyme breaks down protein molecules into smaller peptides?
A. Amylase
B. Lipase
C. Pepsin
D. Sucrase

Which of the following is the function of the pyloric sphincter?
A. To prevent food from entering the stomach
B. To regulate the release of food from the stomach into the small intestine
C. To allow bile to enter the stomach
D. To prevent reflux from the small intestine to the stomach

Which of the following is the primary function of the pancreas in digestion?
A. Secretes bile into the duodenum
B. Secretes digestive enzymes and bicarbonate
C. Absorbs nutrients from the small intestine
D. Stores digestive enzymes

What is the function of the ileocecal valve?
A. To prevent food from entering the small intestine
B. To regulate the passage of food from the stomach into the small intestine
C. To control the flow of food from the small intestine to the large intestine
D. To secrete digestive enzymes

Which type of digestion involves the breakdown of food by enzymes and acids?
A. Chemical digestion
B. Mechanical digestion
C. Absorption
D. Propulsion

Which of the following cells produce hydrochloric acid in the stomach?
A. Chief cells
B. Parietal cells
C. Mucous cells
D. Enteroendocrine cells

What is the function of the gallbladder in digestion?
A. To store and concentrate bile
B. To secrete digestive enzymes
C. To absorb nutrients
D. To store glucose

What is the main function of the enzyme amylase in digestion?
A. To break down fats
B. To break down proteins
C. To break down carbohydrates
D. To break down nucleic acids

What is absorbed in the colon (large intestine)?
A. Nutrients
B. Water and electrolytes
C. Carbohydrates
D. Proteins

Which part of the small intestine is the first to receive chyme from the stomach?
A. Jejunum
B. Ileum
C. Duodenum
D. Cecum

Which of the following is true about the absorption of fats?
A. Fats are absorbed directly into the bloodstream.
B. Fats are absorbed into lymphatic vessels.
C. Fats are absorbed in the large intestine.
D. Fats are absorbed in the stomach.

Which of the following enzymes breaks down proteins into smaller peptides in the stomach?
A. Amylase
B. Pepsin
C. Lipase
D. Trypsin

What is the primary role of gastric acid in the stomach?
A. To neutralize alkaline substances
B. To activate pepsinogen to pepsin
C. To emulsify fats
D. To absorb nutrients

The digestion of which macromolecule begins in the mouth?
A. Fats
B. Carbohydrates
C. Proteins
D. Nucleic acids

What is the function of the enzyme pepsin in digestion?
A. Breaks down carbohydrates
B. Breaks down proteins
C. Breaks down fats
D. Breaks down nucleic acids

Which of the following is true about the small intestine’s role in digestion?
A. It produces bile
B. It absorbs nutrients
C. It stores food
D. It secretes gastric acid

Which nutrient is absorbed by the lymphatic system in the small intestine?
A. Carbohydrates
B. Proteins
C. Fats
D. Water

Which of the following cells in the stomach secrete hydrochloric acid?
A. Chief cells
B. Parietal cells
C. Goblet cells
D. Paneth cells

Which enzyme in the small intestine breaks down maltose into glucose?
A. Maltase
B. Sucrase
C. Lactase
D. Amylase

What is the function of the villi in the small intestine?
A. Secrete digestive enzymes
B. Increase surface area for absorption
C. Produce bile
D. Neutralize stomach acid

Which of the following is a function of the pancreas during digestion?
A. Produces bile
B. Secretes insulin only
C. Secretes digestive enzymes and bicarbonate
D. Absorbs nutrients

Where is bile stored before it is released into the small intestine?
A. Pancreas
B. Stomach
C. Gallbladder
D. Liver

Which hormone stimulates the secretion of gastric acid in the stomach?
A. Insulin
B. Secretin
C. Gastrin
D. Cholecystokinin

Which part of the small intestine is most involved in nutrient absorption?
A. Duodenum
B. Jejunum
C. Ileum
D. Cecum

Which of the following enzymes is produced by the pancreas to aid in protein digestion?
A. Amylase
B. Pepsin
C. Trypsin
D. Lipase

What is the role of the pyloric sphincter in digestion?
A. To prevent food from leaving the stomach
B. To regulate the passage of chyme into the duodenum
C. To protect the stomach lining from acid
D. To secrete digestive enzymes into the stomach

Which of the following is the primary function of the large intestine?
A. Protein digestion
B. Absorption of nutrients
C. Absorption of water and electrolytes
D. Secretion of digestive enzymes

Which enzyme breaks down sucrose into glucose and fructose?
A. Sucrase
B. Lactase
C. Maltase
D. Pepsin

What part of the digestive system absorbs most of the water from indigestible food matter?
A. Stomach
B. Small intestine
C. Large intestine
D. Rectum

Which of the following is primarily responsible for absorbing vitamin B12 in the small intestine?
A. Duodenum
B. Jejunum
C. Ileum
D. Cecum

Which of the following substances is absorbed directly into the bloodstream from the small intestine?
A. Fatty acids
B. Amino acids
C. Glycerol
D. Cholesterol

What is the function of the enteric nervous system in digestion?
A. It produces digestive enzymes
B. It regulates the movement of food through the digestive tract
C. It absorbs nutrients from the small intestine
D. It stores bile in the liver

What is the function of pancreatic amylase?
A. Break down carbohydrates into monosaccharides
B. Break down proteins into peptides
C. Break down fats into fatty acids and glycerol
D. Break down nucleic acids into nucleotides

Which of the following structures in the small intestine is responsible for transporting absorbed nutrients into the bloodstream?
A. Microvilli
B. Lacteals
C. Villus capillaries
D. Goblet cells

What is the function of the liver in digestion?
A. Secrete digestive enzymes
B. Produce bile
C. Absorb nutrients
D. Store food

Which of the following nutrients is absorbed into the lymphatic system before entering the bloodstream?
A. Proteins
B. Carbohydrates
C. Fats
D. Vitamins

What role does the enzyme lipase play in digestion?
A. Breaks down carbohydrates
B. Breaks down proteins
C. Breaks down fats
D. Breaks down nucleic acids

Which part of the digestive system is responsible for storing bile?
A. Pancreas
B. Gallbladder
C. Stomach
D. Small intestine

What is the primary function of hydrochloric acid in the stomach?
A. Emulsify fats
B. Activate digestive enzymes
C. Protect the stomach lining from digestive enzymes
D. Neutralize stomach acid

What role do enzymes play in the digestive process?
A. Increase the temperature of food
B. Break down food into smaller molecules
C. Absorb nutrients into the bloodstream
D. Protect the digestive organs from damage

What is the function of bile salts in digestion?
A. Neutralize stomach acids
B. Emulsify fats to aid in absorption
C. Break down proteins
D. Digestion of carbohydrates

Which of the following is true about the absorption of carbohydrates?
A. Carbohydrates are absorbed as simple sugars
B. Carbohydrates are absorbed as polysaccharides
C. Carbohydrates are absorbed as fiber
D. Carbohydrates are absorbed as complex sugars

Which of the following enzymes is responsible for breaking down protein in the stomach?
A. Amylase
B. Pepsin
C. Lipase
D. Trypsin

What is the main role of the large intestine in digestion?
A. Absorbing nutrients
B. Absorbing water and electrolytes
C. Digesting fats
D. Producing bile

Which structure in the digestive system helps to increase surface area for absorption?
A. Villi
B. Duodenum
C. Esophagus
D. Pancreas

Which of the following hormones stimulates the release of bile from the gallbladder?
A. Gastrin
B. Secretin
C. Cholecystokinin (CCK)
D. Insulin

Which of the following nutrients is absorbed into the bloodstream from the small intestine?
A. Fatty acids
B. Amino acids
C. Fat-soluble vitamins
D. Triglycerides

What is the primary site of carbohydrate digestion in the human digestive system?
A. Stomach
B. Mouth
C. Small intestine
D. Large intestine

Which enzyme begins the breakdown of starch in the mouth?
A. Amylase
B. Pepsin
C. Trypsin
D. Maltase

What is the function of the duodenum in the digestive process?
A. Absorbs most of the nutrients
B. Stores bile
C. Breaks down fats
D. Receives bile and pancreatic juices for further digestion

Which of the following enzymes breaks down fats into fatty acids and glycerol?
A. Amylase
B. Lipase
C. Pepsin
D. Maltase

What role do bile acids play in fat digestion?
A. They break down proteins
B. They emulsify fats into smaller droplets for easier digestion
C. They neutralize stomach acid
D. They absorb vitamins

The absorption of which vitamin requires the presence of intrinsic factor?
A. Vitamin C
B. Vitamin B12
C. Vitamin A
D. Vitamin K

Which of the following digestive enzymes is produced by the pancreas?
A. Lactase
B. Amylase
C. Pepsin
D. Maltase

What is the main function of the liver in digestion?
A. Absorb nutrients
B. Produce digestive enzymes
C. Produce bile to emulsify fats
D. Secrete insulin

Which of the following is a primary function of the small intestine?
A. Secrete bile
B. Digest and absorb nutrients
C. Store food
D. Absorb water

Which of the following is NOT absorbed in the small intestine?
A. Glucose
B. Amino acids
C. Fats
D. Water

What is the function of the sphincter of Oddi?
A. Prevent food from entering the stomach
B. Control the release of bile and pancreatic juice into the duodenum
C. Prevent backflow of bile into the gallbladder
D. Regulate the passage of food into the large intestine

Where does the majority of protein digestion take place?
A. Mouth
B. Stomach
C. Small intestine
D. Large intestine

What type of digestion occurs in the mouth?
A. Mechanical digestion only
B. Chemical digestion only
C. Both mechanical and chemical digestion
D. No digestion occurs in the mouth

What does the enzyme lactase break down?
A. Sucrose
B. Lactose
C. Maltose
D. Starch

Which of the following is true regarding bile salts?
A. They are secreted by the pancreas
B. They help digest proteins
C. They emulsify fats to increase surface area for digestion
D. They are absorbed in the stomach

What is the main function of the pancreas in digestion?
A. Secreting bile
B. Producing digestive enzymes and bicarbonate
C. Absorbing water
D. Producing stomach acid

Which type of molecule is digested by amylase?
A. Proteins
B. Carbohydrates
C. Lipids
D. Nucleic acids

The absorption of which of the following nutrients is facilitated by the presence of bile salts?
A. Proteins
B. Fats
C. Carbohydrates
D. Water

What part of the digestive system absorbs most of the water from the indigestible food residue?
A. Small intestine
B. Large intestine
C. Stomach
D. Pancreas

Which part of the digestive system stores bile?
A. Liver
B. Stomach
C. Gallbladder
D. Pancreas

What is the primary digestive function of the stomach?
A. Absorption of nutrients
B. Mixing food with gastric juices to form chyme
C. Neutralizing acids from the pancreas
D. Digesting proteins

What is the primary site of fat digestion?
A. Mouth
B. Small intestine
C. Stomach
D. Large intestine

Which of the following is absorbed directly into the bloodstream from the small intestine?
A. Fats
B. Amino acids
C. Vitamins
D. Water

What is the function of the intrinsic factor in digestion?
A. To neutralize stomach acid
B. To aid in the absorption of vitamin B12
C. To activate pepsinogen
D. To break down starches

The process of breaking down food into smaller molecules for absorption is called:
A. Ingestion
B. Digestion
C. Absorption
D. Defecation

Which of the following structures secretes digestive enzymes into the small intestine?
A. Pancreas
B. Stomach
C. Large intestine
D. Liver

What is the main role of the pyloric sphincter in digestion?
A. To prevent food from re-entering the esophagus
B. To control the release of food from the stomach to the small intestine
C. To absorb water from digested food
D. To release digestive enzymes into the duodenum

Which of the following is absorbed in the stomach?
A. Proteins
B. Alcohol
C. Carbohydrates
D. Fats

What substance is secreted by the stomach lining to aid in digestion?
A. Hydrochloric acid (HCl)
B. Amylase
C. Bile
D. Salivary amylase

Which of the following hormones stimulates the release of gastric acid in the stomach?
A. Insulin
B. Ghrelin
C. Gastrin
D. Secretin

Which of the following organs is responsible for absorbing most of the nutrients from digested food?
A. Large intestine
B. Stomach
C. Small intestine
D. Pancreas

What is the primary function of the jejunum?
A. Digestion of proteins
B. Absorption of nutrients
C. Storage of bile
D. Breaking down fats

Which of the following enzymes is secreted by the small intestine to break down carbohydrates?
A. Sucrase
B. Pepsin
C. Lactase
D. Amylase

What does the pancreas secrete to help neutralize the acidic chyme coming from the stomach?
A. Hydrochloric acid
B. Bile
C. Sodium bicarbonate
D. Pepsinogen

Which of the following nutrients is absorbed by the lacteals in the villi?
A. Proteins
B. Carbohydrates
C. Lipids
D. Water

Which of the following processes helps to mix food with digestive juices in the stomach?
A. Segmentation
B. Peristalsis
C. Churning
D. Absorption

What is the function of the ileocecal valve?
A. To regulate the flow of bile
B. To separate the stomach and the small intestine
C. To prevent backflow of material from the large intestine to the small intestine
D. To help absorb vitamin B12

Which of the following enzymes is responsible for breaking down lactose?
A. Lactase
B. Lipase
C. Pepsin
D. Amylase

In which part of the digestive system does protein digestion primarily occur?
A. Stomach
B. Small intestine
C. Mouth
D. Large intestine

What is the major digestive function of the liver?
A. Producing insulin
B. Breaking down fats
C. Producing bile
D. Absorbing nutrients

What is the main function of the salivary glands?
A. To secrete bile for fat digestion
B. To neutralize stomach acid
C. To produce saliva containing enzymes to begin digestion
D. To absorb nutrients

Which of the following does NOT participate in digestion?
A. Bile
B. Amylase
C. Pepsin
D. Lymphocytes

What part of the brain controls the process of digestion?
A. Cerebellum
B. Medulla oblongata
C. Thalamus
D. Hypothalamus

Which structure is responsible for secreting insulin to regulate blood sugar levels?
A. Gallbladder
B. Liver
C. Pancreas
D. Small intestine

What is the primary role of the stomach’s mucus layer?
A. To aid in the absorption of water
B. To protect the stomach lining from gastric acid
C. To digest proteins
D. To secrete digestive enzymes

Which of the following enzymes is found in the stomach and breaks down proteins?
A. Amylase
B. Pepsin
C. Lactase
D. Lipase

The process of nutrient absorption occurs primarily in which part of the digestive tract?
A. Stomach
B. Small intestine
C. Large intestine
D. Esophagus

What part of the digestive system produces bile?
A. Pancreas
B. Liver
C. Gallbladder
D. Duodenum

What is the function of bile in digestion?
A. To break down carbohydrates
B. To emulsify fats for easier digestion
C. To neutralize stomach acids
D. To digest proteins

What does the hormone secretin stimulate?
A. Release of gastric acid
B. Release of insulin
C. Secretion of pancreatic juice to neutralize stomach acid
D. Secretion of bile

What is the primary function of the villi in the small intestine?
A. Secreting digestive enzymes
B. Absorbing nutrients
C. Producing bile
D. Breaking down fats

Which of the following nutrients is absorbed through the lymphatic system?
A. Amino acids
B. Fat-soluble vitamins
C. Carbohydrates
D. Water-soluble vitamins

Which of the following enzymes is produced by the pancreas to aid in protein digestion?
A. Trypsin
B. Lactase
C. Pepsin
D. Amylase

What is the role of the small intestine in absorption?
A. Absorbing all nutrients and water
B. Absorbing vitamins and minerals only
C. Absorbing carbohydrates and proteins only
D. Absorbing fats only

Which of the following substances is absorbed by the stomach?
A. Glucose
B. Alcohol
C. Amino acids
D. Fatty acids

Which of the following is primarily responsible for the digestion of starches?
A. Pepsin
B. Amylase
C. Lipase
D. Trypsin

What is the role of bicarbonate ions secreted by the pancreas?
A. To digest proteins
B. To neutralize stomach acid entering the small intestine
C. To emulsify fats
D. To absorb nutrients

Where are the majority of digestive enzymes secreted from in the digestive system?
A. Mouth
B. Small intestine
C. Stomach
D. Pancreas

Which of the following is absorbed directly into the bloodstream from the small intestine?
A. Amino acids
B. Fatty acids
C. Glycerol
D. Bile salts

What is the primary function of the large intestine?
A. Absorption of nutrients
B. Storage and concentration of undigested food
C. Breakdown of proteins
D. Digestion of fats

Which of the following is a major site for water absorption in the digestive system?
A. Stomach
B. Small intestine
C. Large intestine
D. Duodenum

What is the main function of the gallbladder in digestion?
A. To produce digestive enzymes
B. To store bile and release it into the small intestine
C. To neutralize stomach acid
D. To absorb nutrients

What is the primary component of bile that aids in fat digestion?
A. Cholesterol
B. Bile salts
C. Bilirubin
D. Lecithin

What is the function of intrinsic factor in digestion?
A. It helps emulsify fats
B. It protects the stomach lining from acid
C. It aids in the absorption of vitamin B12
D. It stimulates gastric acid production

Which part of the digestive system is primarily responsible for the absorption of vitamin B12?
A. Stomach
B. Small intestine
C. Large intestine
D. Duodenum

What is the main enzyme involved in the digestion of lipids in the small intestine?
A. Pepsin
B. Lipase
C. Amylase
D. Trypsin

Which of the following is the function of gastric acid in the stomach?
A. To break down carbohydrates
B. To digest proteins
C. To neutralize bile
D. To absorb water

What triggers the release of bile from the gallbladder?
A. Gastrin
B. Secretin
C. Cholecystokinin (CCK)
D. Insulin

In what part of the digestive tract does most protein digestion occur?
A. Stomach
B. Small intestine
C. Large intestine
D. Mouth

What is the major role of the pancreas in digestion?
A. To produce bile
B. To absorb nutrients
C. To secrete digestive enzymes and bicarbonate
D. To store nutrients

The process of absorption in the small intestine is facilitated by which of the following structures?
A. Microvilli
B. Mucus
C. Cilia
D. Sphincters

What is the function of the liver in digestion?
A. To store bile
B. To secrete digestive enzymes
C. To break down proteins
D. To detoxify substances and produce bile

Which of the following does NOT contribute to the mechanical digestion of food?
A. Churning in the stomach
B. Peristalsis
C. Bile secretion
D. Mastication (chewing)

Which of the following vitamins is fat-soluble and absorbed in the small intestine?
A. Vitamin C
B. Vitamin B12
C. Vitamin A
D. Vitamin B1

What is the role of villi in the small intestine?
A. To secrete digestive enzymes
B. To absorb nutrients into the bloodstream
C. To break down fats
D. To produce bile

What is the function of the pyloric sphincter?
A. To prevent food from entering the esophagus
B. To regulate the flow of chyme into the small intestine
C. To allow the release of digestive enzymes from the pancreas
D. To protect the small intestine from gastric acid

Which of the following is NOT a function of the large intestine?
A. Absorption of water and electrolytes
B. Fermentation of indigestible carbohydrates
C. Digestion of proteins
D. Storage of feces

Which of the following is absorbed by active transport in the small intestine?
A. Fatty acids
B. Water
C. Glucose
D. Bile acids

What is the main function of the duodenum in digestion?
A. Absorption of nutrients
B. Secretion of digestive enzymes
C. Neutralization of stomach acid and digestion of fats
D. Storage of undigested food

Which of the following digestive enzymes acts on proteins?
A. Amylase
B. Lipase
C. Pepsin
D. Lactase

How is most of the water reabsorbed in the digestive system?
A. In the small intestine
B. In the mouth
C. In the stomach
D. In the large intestine

What type of molecule is digested by the enzyme lactase?
A. Proteins
B. Fats
C. Lactose (a sugar)
D. Starches

Which enzyme secreted by the pancreas is responsible for digesting fats?
A. Amylase
B. Lipase
C. Trypsin
D. Pepsin

Where is bile stored before being released into the small intestine?
A. Pancreas
B. Stomach
C. Gallbladder
D. Duodenum

What is the primary purpose of the small intestine’s circular folds?
A. To increase the surface area for nutrient absorption
B. To churn the food and mix it with digestive enzymes
C. To store bile
D. To secrete digestive enzymes