Biology Digestion/Nutrition MDCAT 2015
PMDC Verified Question 43 of 48
The hormone which increases the secretion of pancreatic juice is:
A
Secretin
B
Thyroxine
C
Gastrin
D
Parathormone
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Secretin
Concept:

When acidic chyme exits the stomach and enters the small intestine, the intestinal environment must be rapidly neutralized.

Formula:

N/A

Solution:

  • The acidic pH stimulates the S-cells of the duodenal mucosa to release the hormone Secretin.
  • Secretin travels via the blood to the pancreas, where it vigorously stimulates the secretion of pancreatic juice rich in bicarbonate ions (\(HCO_3^-\)).
  • This neutralizes the acid, providing the optimal alkaline pH for intestinal enzymes.


Why other options are incorrect:

Gastrin stimulates the stomach. Thyroxine regulates basal metabolic rate. Parathormone regulates blood calcium levels. None of these target the exocrine pancreas.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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