Why does pancreatic enzyme activity sharply decrease as chyme enters the jejunum in a patient with untreated celiac disease?

💡 Explanation

In celiac disease, villous atrophy impairs secretin release in the duodenum, which normally stimulates pancreatic enzyme secretion. Because this stimulation is reduced, pancreatic enzyme activity decreases in the jejunum; therefore, impaired secretin release is the main reason, rather than altered vagal stimulation or direct inhibition.

• Why does late luteal phase support of the endometrium fail during cycles without fertilization?
• In Alzheimer's disease, what distinguishes microglial TREM2 activation during the clearance of amyloid plaques, relative to its baseline function?
• In a patient with type 2 diabetes, if insulin levels are chronically elevated, which consequence becomes more likely at the cellular level in peripheral tissues?
• If a retinal detachment separates photoreceptors from the retinal pigment epithelium (RPE), which consequence follows, hindering vision?
• Why does septic shock, initiated by a localized bacterial infection, sometimes trigger multi-organ failure distantly, despite antibiotic treatment eliminating the original infection source?
• Why does long-term vaccine efficacy against a virus often rely on repeated exposures rather than a single dose?