Nokea
Which structure helps to prevent a bolus of food from entering the trachea during deglutition (swallowing)?
- A. collagen
- B. cardiac sphincter
- C. larynx
- D. epiglottis
Correct Answer: D
Rationale: The epiglottis is a flap of cartilage that covers the trachea during swallowing, preventing food from entering the airway.
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The absorption of fructose by intestinal mucosa is
- A. Co-transport mechanism
- B. Simple diffusion
- C. Facilitated transport
- D. Active transport
Correct Answer: C
Rationale: Fructose is absorbed via facilitated transport through GLUT5 transporters in the intestinal mucosa.
Taste buds are found in the following areas EXCEPT:
- A. Oral mucosa & soft palate
- B. Esophagus
- C. Laryngeal surface of Epiglottis
- D. Tongue papilla
Correct Answer: C
Rationale: Taste buds are absent in the esophagus; they are present on the tongue, soft palate, and epiglottis for taste perception.
The terminal portion of the small intestine is the:
- A. ileum
- B. cecum
- C. duodenum
- D. jejunum
Correct Answer: A
Rationale: The ileum is the final section of the small intestine, connecting to the large intestine.
The primary site for absorption of water by the digestive system is the:
- A. oesophagus
- B. colon (large intestine)
- C. small intestine
- D. liver
Correct Answer: B
Rationale: The colon (large intestine) is the primary site for water absorption, consolidating waste into feces.
What are the substrate and end-products of digestion by the enzyme lipase?
- A. substrate: triglycerides, end-products: fatty acids and glycerol
- B. substrate: proteins, end-products: amino acids
- C. substrate: carbohydrates, end-products: monosaccharides
- D. substrate: nucleic acids, end-products: nucleotides
Correct Answer: A
Rationale: Lipase hydrolyzes triglycerides into their component fatty acids and glycerol.