Nokea
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.
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Peptide hormones are made of protein and are water soluble. They can therefore:
- A. Pass straight through the lipid bilayer and react with other molecules inside the cell
- B. React to a specific binding site on the outside of the membrane and create a secondary response
- C. Pass through a protein channel to the inside of the cell and then react with other molecules inside the cell
- D. Don't react with anything on the membrane or in the cell but cause their effect by other processes
Correct Answer: B
Rationale: Peptide hormones bind to membrane receptors, triggering secondary messengers inside the cell.
Which gastric secretion is necessary for the absorption of vitamin B12 in the small intestine?
- A. Hydrochloric acid (HCl)
- B. Pepsinogen
- C. Intrinsic factor
- D. Mucus
Correct Answer: C
Rationale: Intrinsic factor, secreted by parietal cells in the stomach, binds to vitamin B12, enabling its absorption in the ileum of the small intestine.
Lipase is the enzyme that catalyses the breakdown of triacylglycerol into:
- A. Amino acids
- B. Lipids
- C. Fatty acids and glycerol
- D. Simple sugars
Correct Answer: C
Rationale: Lipase breaks down triacylglycerols into fatty acids and glycerol, aiding in the digestion and absorption of fats.
Filiform papilla of tongue:
- A. Present at sulcus terminalis.
- B. Covered by Parakeratinized epith.
- C. Carry taste buds.
- D. Has underlying Von Ebner's glands.
Correct Answer: B
Rationale: Filiform papillae are covered by parakeratinized epithelium and are numerous on the anterior tongue, but they do not carry taste buds or have Von Ebner's glands.
CAVEOLATED CELLS all true except:
- A. Rare cells in gastric & intestinal mucosa may be chemoreceptor
- B. Their microvilli are long twice the length of those nearby cells
- C. Apical cell membrane shows deep tubular invaginations (Caveolae).
- D. Important cell for mucosal regeneration
Correct Answer: D
Rationale: Caveolated (tuft) cells are sensory, not regenerative; stem cells handle mucosal regeneration.