Digestive System MCQs with Answers

One-liner

The lower oesophageal (cardiac) sphincter prevents backflow from the stomach into the oesophagus, just as the epiglottis prevents food from entering the trachea.

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The digestion of food by an animal is an example of catabolism, which is the breakdown of complex molecules into simpler ones, releasing energy.

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If the rhythmic action (peristalsis) of the digestive tract becomes too fast, it causes diarrhea.

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The pH of the mouth decreases after eating because bacteria releases acids by fermenting food sugars left in the mouth.

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The stomach produces Hydrochloric Acid (HCl) in its gastric juice to help digest food.

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The stomach works like a mixer, churning and blending food with digestive juices to form a semi-liquid paste called chyme.

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Digestion begins in the mouth, where food is mechanically broken down by chewing and chemically broken down by enzymes in saliva.

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The small intestine is composed of three segments: the duodenum, jejunum, and ileum.

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Wharton's duct is the duct of the salivary gland (specifically the submandibular salivary gland).

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Fats are absorbed in the small intestine.