🔤ost common
2️⃣0️⃣ multiple-choice questions with answers about  human digestive system(Do it)

1. Digestion begins in the:

A) Stomach
B) Small intestine
C) Mouth ✅
D) Esophagus

2. Which enzyme breaks down proteins in the stomach?

A) Amylase
B) Lipase
C) Pepsin ✅
D) Trypsin

3. Bile is produced by the:

A) Gallbladder
B) Liver ✅
C) Pancreas
D) Stomach

4. The majority of nutrient absorption happens in the:

A) Stomach
B) Large intestine
C) Small intestine ✅
D) Esophagus

5. Finger-like projections in the small intestine that increase surface area for absorption are called:

A) Cilia
B) Villi ✅
C) Microvilli (also correct, but villi is the standard answer)
D) Alveoli

6. Which organ stores bile?

A) Liver
· B) Pancreas
· C) Gallbladder ✅
· D) Appendix

7. The muscular tube connecting the mouth to the stomach is the:

· A) Trachea
· B) Pharynx
· C) Esophagus ✅
· D) Duodenum

8. What is the primary function of the large intestine?

· A) Digest proteins
· B) Absorb water and electrolytes ✅
· C) Produce bile
· D) Break down carbohydrates

9. The semi-fluid mass of partially digested food that leaves the stomach is called:

· A) Bolus
· B) Chyme ✅
· C) Feces
· D) Bile

10. Which enzyme breaks down starch into sugars?

· A) Pepsin
· B) Lipase
· C) Amylase ✅
· D) Nuclease

11. The flap of tissue that prevents food from entering the trachea during swallowing is the:

· A) Uvula
· B) Epiglottis ✅
· C) Glottis
· D) Palate

12. Which part of the digestive system absorbs water and forms feces?

· A) Small intestine
· B) Stomach
· C) Large intestine ✅
· D) Rectum

13. Heartburn occurs when stomach acid backs up into the:

· A) Trachea
· B) Esophagus ✅
· C) Pharynx
· D) Duodenum

14. The pancreas secretes:

· A) Bile
· B) Hydrochloric acid
· C) Digestive enzymes and bicarbonate ✅
· D) Mucus only

15. Which vitamin is produced by bacteria in the large intestine?

· A) Vitamin C
· B) Vitamin D
· C) Vitamin K ✅
· D) Vitamin B1

16. What is the main function of bile in digestion?
A) Break down proteins
B) Emulsify fats✅
C) Digest starch
D) Absorb water

17. Which movement pushes food along the digestive tract?
A) Diffusion
B) Filtration
C) Peristalsis✅
D) Respiration

18/Which enzyme in saliva begins the digestion of starch?
A) Pepsin
B) Salivary amylase✅
C) Lipase
D) Trypsin

19. Which substance in the stomach helps kill many harmful microorganisms in food?
A) Bile
B) Saliva
C) Hydrochloric acid✅
D) Bicarbonate

20/Which part of the small intestine receives bile and pancreatic juice?
A) Duodenum✅
B) Ileum
C) Jejunum
D) Rectum

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