Digestive System Practice Test

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Digestive System Practice Test - Quiz

Do you know how our digestive system works in our body? If so, take up this practice test and evaluate yourself. The function of the digestive system is digestion and absorption. The system is divided into two parts, and they are charged with ensuring there is a breakdown of food into nutrients, which the body uses for energy, growth, and cell repair. Test what else you know about the organs in the system through the quiz. Good luck!


Questions and Answers
  • 1. 

    In which organ does digestion begin?

    • A.

      Mouth

    • B.

      Stomach

    • C.

      Small Intestine

    • D.

      Large Intestine

    • E.

      Stomach and small intestine

    Correct Answer
    A. Mouth
    Explanation
    Digestion begins in the mouth. This is where the process of breaking down food begins, as the teeth chew and grind the food into smaller pieces. Saliva is also produced in the mouth, which contains enzymes that help to break down carbohydrates. Therefore, the mouth plays a crucial role in the initial stages of digestion.

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  • 2. 

    What is the name of the stomach cell that secretes hydrochloric acid?

    • A.

      Chrondocyte

    • B.

      Chief cell

    • C.

      Parietal cell

    • D.

      Gastric cell

    • E.

      Glial cell

    Correct Answer
    C. Parietal cell
    Explanation
    The correct answer is parietal cell. Parietal cells are stomach cells that are responsible for secreting hydrochloric acid. This acid plays a crucial role in the digestion process by breaking down food and killing bacteria in the stomach. The other options listed are not associated with the secretion of hydrochloric acid in the stomach.

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  • 3. 

    Which of the following is NOT part of the GI tract?

    • A.

      Esophagus

    • B.

      Stomach

    • C.

      Small Intestine

    • D.

      Large Intestine

    • E.

      Pancreas

    Correct Answer
    E. Pancreas
    Explanation
    The pancreas is not part of the GI tract. The GI tract, or gastrointestinal tract, refers to the pathway through which food travels in the body for digestion and absorption. It includes the esophagus, stomach, small intestine, and large intestine. The pancreas, although it plays a crucial role in digestion by producing enzymes and hormones, is not part of the actual pathway that food takes. Instead, the pancreas is located adjacent to the GI tract and releases its digestive enzymes and hormones into the small intestine.

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  • 4. 

    Which of the following is NOT a phase of gastric secretion?

    • A.

      Cephalic phase

    • B.

      Gastric phase

    • C.

      Duodenal phase

    • D.

      Intestinal phase

    • E.

      All of these are phase of gastric secretion

    Correct Answer
    C. Duodenal phase
    Explanation
    The duodenal phase is not a phase of gastric secretion. The gastric secretion process consists of three phases: the cephalic phase, gastric phase, and intestinal phase. The duodenal phase refers to the phase of digestion that occurs in the duodenum, the first part of the small intestine, and is not directly involved in gastric secretion.

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  • 5. 

    Which of the following macromolecules is digested in the small intestine?

    • A.

      Protein

    • B.

      Lipids

    • C.

      Carbohydrates

    • D.

      Nucleic acids

    • E.

      All of the above

    Correct Answer
    E. All of the above
    Explanation
    All of the macromolecules mentioned (protein, lipids, carbohydrates, nucleic acids) are digested in the small intestine. The small intestine is responsible for the majority of digestion and absorption of nutrients in the body. Proteins are broken down into amino acids, lipids into fatty acids and glycerol, carbohydrates into simple sugars, and nucleic acids into nucleotides. These smaller molecules are then absorbed into the bloodstream for use by the body. Therefore, all of the mentioned macromolecules are digested in the small intestine.

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  • 6. 

    The enzyme amylase is secreted into the

    • A.

      Mouth.

    • B.

      Stomach.

    • C.

      Small intestine.

    • D.

      Mouth and small intestine.

    • E.

      Mouth and pancreas

    Correct Answer
    D. Mouth and small intestine.
    Explanation
    Amylase is an enzyme that helps in the digestion of carbohydrates. It is secreted in the mouth by the salivary glands, where it begins the process of breaking down starches into smaller sugar molecules. After that, the partially digested food enters the small intestine, where pancreatic amylase continues the digestion of carbohydrates. Therefore, the correct answer is that amylase is secreted into both the mouth and the small intestine.

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  • 7. 

    The major movement of food through the GI tract is called

    • A.

      Peristalsis

    • B.

      Segmentation

    • C.

      Hostile churning

    • D.

      Chyme propulsion

    • E.

      Swallowing

    Correct Answer
    A. Peristalsis
    Explanation
    Peristalsis is the correct answer because it refers to the coordinated muscle contractions that propel food through the gastrointestinal (GI) tract. These rhythmic contractions occur in a wave-like motion and help to move food from the esophagus to the stomach, and then through the small intestine and large intestine. Peristalsis plays a crucial role in digestion by ensuring that food is properly broken down and absorbed by the body.

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  • 8. 

    Which of the following enzymes digests protein?

    • A.

      Pepsin

    • B.

      Lipase

    • C.

      Amylase

    • D.

      Trypsin

    • E.

      Pepsin and Trypsin

    Correct Answer
    E. Pepsin and Trypsin
    Explanation
    Pepsin and Trypsin are enzymes that digest protein. Pepsin is produced in the stomach and breaks down proteins into smaller peptides. Trypsin is produced in the pancreas and further breaks down peptides into amino acids. Lipase is an enzyme that digests fats, while amylase digests carbohydrates. Therefore, the correct answer is Pepsin and Trypsin.

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  • 9. 

    In which gastrointestinal organ does the majority of digestion and absorption occur?

    Correct Answer
    small intestine, Small Intestine, small Intestine
    Explanation
    The majority of digestion and absorption occur in the small intestine. This organ is responsible for breaking down food into smaller molecules and absorbing nutrients into the bloodstream. Its large surface area, thanks to the presence of villi and microvilli, allows for efficient absorption of nutrients. The small intestine also receives digestive enzymes from the pancreas and bile from the liver, further aiding in the digestion process.

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  • 10. 

    Which two secretions need to be present for lipid digestion?

    • A.

      Amylase and lipase

    • B.

      Bile and pepsin

    • C.

      Bile and lipase

    • D.

      Pepsin and lipase

    • E.

      Pepsin and trypsin

    Correct Answer
    C. Bile and lipase
    Explanation
    Bile and lipase are the two secretions that need to be present for lipid digestion. Bile, produced by the liver and stored in the gallbladder, helps in the emulsification of fats, breaking them down into smaller droplets. Lipase, produced by the pancreas, is an enzyme that breaks down fats into fatty acids and glycerol, which can then be absorbed by the body. Therefore, the presence of both bile and lipase is necessary for the effective digestion and absorption of lipids.

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  • 11. 

    Which organ secretes the majority of digestive enzymes?

    • A.

      Pancreas

    • B.

      Mouth

    • C.

      Small intestine

    • D.

      Liver

    • E.

      Stomach

    Correct Answer
    A. Pancreas
    Explanation
    The pancreas secretes the majority of digestive enzymes. These enzymes are responsible for breaking down carbohydrates, proteins, and fats in the small intestine. The pancreas releases these enzymes into the small intestine through the pancreatic duct. This process is crucial for proper digestion and absorption of nutrients.

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  • 12. 

    What is the major cause of duodenal and stomach ulcers?

    • A.

      Acid reflux

    • B.

      Helicobacter pylori

    • C.

      Stress

    • D.

      Alcohol

    • E.

      Acid reflux and Helicobacter pylori

    Correct Answer
    B. Helicobacter pylori
    Explanation
    Helicobacter pylori is the major cause of duodenal and stomach ulcers. This bacterium infects the lining of the stomach and duodenum, leading to inflammation and the formation of ulcers. Acid reflux can contribute to the development of ulcers, but it is not the primary cause. Stress and alcohol can worsen ulcers, but they are not the main underlying cause. Therefore, the correct answer is Helicobacter pylori.

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  • 13. 

    What is the adult dental formula

    • A.

      2:2:1:3

    • B.

      2:1:3:2

    • C.

      2:3:1:2

    • D.

      2:1:3:3

    • E.

      2:1:2:3

    Correct Answer
    E. 2:1:2:3
    Explanation
    The adult dental formula refers to the number and arrangement of teeth in the mouth. The correct answer, 2:1:2:3, means that in each half of the mouth, there are 2 incisors, 1 canine, 2 premolars, and 3 molars. This formula represents the typical dental arrangement in adults.

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  • 14. 

    In the mouth _______________ mechanically digest food.

    Correct Answer
    teeth, Teeth
    Explanation
    The teeth in the mouth are responsible for mechanically breaking down or digesting food. They chew and grind the food into smaller pieces, making it easier to swallow and further process in the digestive system.

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  • 15. 

    In the mouth ________________ chemically digests food.

    Correct Answer
    amylase, amylaze
    Explanation
    Amylase is an enzyme that is present in the mouth and helps in the chemical digestion of food. It breaks down complex carbohydrates into simpler sugars, such as glucose, which can be easily absorbed by the body. The correct answer is "amylase" as it correctly identifies the enzyme responsible for the chemical digestion of food in the mouth. The term "amylaze" is likely a typo or misspelling of "amylase".

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  • 16. 

    What important nutrient is made in the large intestine?

    • A.

      Protein

    • B.

      Calcium

    • C.

      Vitamin A

    • D.

      Vitamin K

    • E.

      Vitamin C

    Correct Answer
    D. Vitamin K
    Explanation
    Vitamin K is made in the large intestine. It is an essential nutrient for blood clotting and bone health. The large intestine contains bacteria that produce vitamin K, which can then be absorbed by the body. This vitamin is important for the synthesis of certain proteins involved in blood clotting, preventing excessive bleeding. It also plays a role in maintaining bone health by regulating calcium metabolism. While other nutrients listed are important for overall health, they are not specifically produced in the large intestine.

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  • 17. 

    What is the hardest substance in the human body?

    • A.

      Bone

    • B.

      Dentin

    • C.

      Enamel

    • D.

      Fibrocartilage

    • E.

      Hyaline cartilage

    Correct Answer
    C. Enamel
    Explanation
    Enamel is the hardest substance in the human body. It is the outermost layer of the teeth and provides protection against wear and tear, as well as against acid and bacteria. Enamel is composed of a dense mineral structure, primarily hydroxyapatite, which makes it extremely durable and resistant to damage. It is even harder than bone, dentin, fibrocartilage, and hyaline cartilage, which are also present in the human body.

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  • 18. 

    In which digestive organ is chyme produced?

    • A.

      Mouth

    • B.

      Stomach

    • C.

      Small intestine

    • D.

      Large intestine

    • E.

      Pancreas

    Correct Answer
    B. Stomach
    Explanation
    Chyme is produced in the stomach. The stomach is a muscular organ that receives food from the esophagus and churns it with gastric juices to break it down into a semi-fluid mixture called chyme. This mixture is then gradually released into the small intestine for further digestion and absorption of nutrients. The stomach plays a crucial role in the early stages of digestion by mixing and breaking down food particles into a form that can be processed by the rest of the digestive system.

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  • 19. 

    Villi and microvilli increase the surface area of the _________________________.

    Correct Answer
    small intestine
    Explanation
    Villi and microvilli increase the surface area of the small intestine. This increased surface area allows for a greater absorption of nutrients from the digested food. The small intestine is responsible for the majority of nutrient absorption in the digestive system. The villi are finger-like projections that line the inner walls of the small intestine, while microvilli are even smaller projections on the surface of the villi. Together, they greatly increase the surface area available for absorption, allowing for more efficient digestion and absorption of nutrients.

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  • 20. 

    What is the name of the epithelial tissue that lines the stomach and small intestine? Options: A. simple columnar epithelium B. complex columnar epithelium C. Both D. None of the above

    Correct Answer
    A. simple columnar epithelium
    Explanation
    The correct answer is A. simple columnar epithelium. This type of epithelial tissue is found in the lining of the stomach and small intestine. It consists of a single layer of tall, column-shaped cells that are closely packed together. This tissue is specialized for absorption and secretion, which are important functions of the stomach and small intestine. The cells of the simple columnar epithelium have microvilli on their surface, which increase the surface area for absorption.

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  • 21. 

    What is the name of the epithelial tissue that lines the mouth and most of the esophagus? Options: A. stratified squamous epithelium B. simple squamous epithelium C. Both D. None

    Correct Answer
    A. stratified squamous epithelium
    Explanation
    The correct answer is A. stratified squamous epithelium. This type of epithelial tissue is found in areas that experience a lot of wear and tear, such as the mouth and esophagus. It consists of multiple layers of flat cells, providing protection and allowing for the easy movement of food and liquids.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • May 08, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 04, 2009
    Quiz Created by
    Dbiro
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