Definition

Noun: A polypeptide hormone secreted by the duodenal mucosa when acid chyme from the stomach enters the small intestine. Its primary physiological action is to stimulate the pancreas to secrete a watery, bicarbonate-rich fluid, which helps neutralize the acidic stomach contents in the duodenum.

Usage

"Secretin" is used exclusively as a noun in medical and physiological contexts to refer to this specific hormone. It is typically used with verbs like stimulate, release, secrete, administer, or measure. - The presence of acid in the duodenum triggers the release of secretin. - Researchers administered secretin to study pancreatic function. - The test measures blood secretin levels.

Examples

• Secretin is a key regulator of pancreatic exocrine secretion.
• The doctor explained that secretin helps neutralize stomach acid in the intestines.
• A synthetic form of secretin is sometimes used in diagnostic medical tests.

Advanced Usage

• Secretin stimulation test: A diagnostic procedure where synthetic secretin is injected to evaluate the function of the pancreas, particularly in conditions like chronic pancreatitis.
  • The patient underwent a secretin stimulation test to assess pancreatic insufficiency.

Variants and Related Words

• Secretin family: A group of structurally related peptide hormones that includes secretin, glucagon, and vasoactive intestinal peptide (VIP).
• Secretin receptor: The specific protein on the surface of target cells (like pancreatic duct cells) that secretin binds to in order to exert its effect.

Synonyms

• Gastrointestinal hormone: This is a broader category to which secretin belongs. There is no single common synonym for the specific hormone "secretin."

Different Meanings

The word "secretin" has only one specific meaning in modern English: the gastrointestinal hormone described above. It is not used in other general or figurative senses.

Notes on Usage

"Secretin" is a specialized scientific term. It is almost never used in everyday conversation and is primarily found in academic papers, medical textbooks, and clinical discussions. It is always treated as a singular, uncountable noun (e.g., "Secretin is released," not "Secretins are released").

Noun

1. a gastrointestinal hormone that stimulates the secretion of water and bicarbonate from the pancreas and bile ducts whenever the stomach empties too much acid into the small intestine