Digestive System Anatomy Quiz (Free Practice)

About the Digestive System

The digestive system breaks food down into nutrients the body can absorb and use for energy, growth, and repair. It includes the mouth, esophagus, stomach, small intestine, large intestine, rectum, and anus. Accessory organs such as the liver, gallbladder, and pancreas support digestion by producing or storing important substances like bile and enzymes.

Digestive anatomy is commonly tested in anatomy classes, nursing study, TEAS science review, and other healthcare-related exam prep. Learning the structure and function of each organ makes it easier to understand nutrition, absorption, elimination, and common disorders.

Digestive System Practice Questions

1. Where does digestion begin?
   • A. Stomach
   • B. Mouth
   • C. Small intestine
   • D. Esophagus
   Answer: B. Mouth — Digestion begins in the mouth with chewing and saliva.
2. Which organ carries food from the mouth to the stomach?
   • A. Trachea
   • B. Colon
   • C. Esophagus
   • D. Liver
   Answer: C. Esophagus — The esophagus moves food to the stomach through peristalsis.
3. Which organ is primarily responsible for most nutrient absorption?
   • A. Stomach
   • B. Small intestine
   • C. Large intestine
   • D. Gallbladder
   Answer: B. Small intestine — Most nutrient absorption takes place in the small intestine.
4. Which organ produces bile?
   • A. Pancreas
   • B. Stomach
   • C. Liver
   • D. Gallbladder
   Answer: C. Liver — The liver produces bile to help digest fats.
5. What is the main function of the stomach?
   • A. Absorb water
   • B. Break down food with acid and enzymes
   • C. Produce red blood cells
   • D. Filter waste from the blood
   Answer: B. Break down food with acid and enzymes — The stomach begins major chemical digestion.
6. Which organ stores bile until it is needed?
   • A. Gallbladder
   • B. Pancreas
   • C. Appendix
   • D. Colon
   Answer: A. Gallbladder — The gallbladder stores and concentrates bile.
7. The pancreas helps digestion by releasing:
   • A. Oxygen
   • B. Digestive enzymes
   • C. Mucus only
   • D. Red blood cells
   Answer: B. Digestive enzymes — The pancreas releases enzymes that help break down food.
8. The small intestine is divided into three parts. Which is the correct order from the stomach to the large intestine?
   • A. Duodenum, Jejunum, Ileum
   • B. Ileum, Jejunum, Duodenum
   • C. Jejunum, Duodenum, Ileum
   • D. Duodenum, Ileum, Jejunum
   Answer: A. Duodenum, Jejunum, Ileum — This is the correct order of the small intestine sections.
9. What is the first part of the small intestine?
   • A. Jejunum
   • B. Ileum
   • C. Duodenum
   • D. Cecum
   Answer: C. Duodenum — It is the first segment where most chemical digestion begins.
10. Which organ secretes insulin?
    • A. Liver
    • B. Gallbladder
    • C. Pancreas
    • D. Stomach
    Answer: C. Pancreas — It regulates blood sugar through insulin.
11. What increases surface area for absorption?
    • A. Alveoli
    • B. Villi
    • C. Nephrons
    • D. Axons
    Answer: B. Villi — They increase absorption in the small intestine.
12. Which organ detoxifies chemicals and metabolizes drugs?
    • A. Pancreas
    • B. Liver
    • C. Stomach
    • D. Colon
    Answer: B. Liver — It plays a key role in detoxification.
13. The large intestine mainly absorbs:
    • A. Calcium
    • B. Protein
    • C. Water
    • D. Oxygen
    Answer: C. Water — The large intestine absorbs water and helps form stool.
14. Which structure prevents food from entering the airway?
    • A. Trachea
    • B. Epiglottis
    • C. Larynx
    • D. Esophagus
    Answer: B. Epiglottis — It covers the airway during swallowing.
15. Which enzyme begins carbohydrate digestion?
    • A. Pepsin
    • B. Lipase
    • C. Amylase
    • D. Trypsin
    Answer: C. Amylase — Found in saliva, it starts breaking down starches.
16. Where is hydrochloric acid produced?
    • A. Pancreas
    • B. Small intestine
    • C. Stomach
    • D. Liver
    Answer: C. Stomach — Gastric glands produce hydrochloric acid.
17. Which organ releases digestive enzymes and hormones?
    • A. Liver
    • B. Pancreas
    • C. Gallbladder
    • D. Colon
    Answer: B. Pancreas — The pancreas releases digestive enzymes and hormones like insulin.
18. Which part of the large intestine comes first?
    • A. Rectum
    • B. Cecum
    • C. Sigmoid colon
    • D. Descending colon
    Answer: B. Cecum — The cecum is the first part of the large intestine.
19. Which part stores waste before elimination?
    • A. Rectum
    • B. Colon
    • C. Stomach
    • D. Pancreas
    Answer: A. Rectum — The rectum stores waste before elimination.
20. Which structure eliminates waste from the body?
    • A. Rectum
    • B. Anus
    • C. Colon
    • D. Cecum
    Answer: B. Anus — The anus is the terminal opening for waste elimination.

Why Practice Digestive Anatomy?

Studying digestive anatomy helps reinforce both organ recognition and function. It also supports understanding of common topics such as acid reflux, ulcers, malabsorption, constipation, diarrhea, and liver-related disease. Repetition improves recall and helps build confidence for quizzes, tests, and exam prep.