35. Coming from the acid pH
of the stomach which pH level
does the chyme find when it
enters the duodenum? Why is
it necessary to maintain that
pH level in the small intestine?
What are the organs
responsible for that pH level
and how is it kept?

Gap-fill exercise

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Entering the duodenum chyme
meets the juice under a
of approximately 8.5. neutralization
of the acidity is necessary
keep adequate pH for the
functioning the digestive enzymes
act in the . Without the
neutralization the chyme acidity
mucous membrane of intestine
would be .

When stimulated by chyme acidity
the makes a hormone
secretin. Secretin stimulates
pancreas to release pancreatic juice
and the gallbladder to bile in
the . The pancreatic
secretion, in bicarbonate ions,
released in the and
neutralizes the acidity; this
acidity also neutralized by
secretion of bile the duodenal lumen.