The duodenum secretes a hormone which has following effects except:
**Core Concept**
The duodenum secretes a hormone called secretin, which plays a crucial role in regulating pancreatic and bile duct secretions in response to acidic chyme entering the duodenum. Secretin is a hormone that stimulates the release of bicarbonate-rich pancreatic juice to neutralize the acidity.
**Why the Correct Answer is Right**
Secretin has several effects on the pancreas and bile ducts. It stimulates the pancreas to release bicarbonate-rich pancreatic juice, which helps to neutralize the acidity of the chyme entering the duodenum. Secretin also stimulates the pancreas to release digestive enzymes, such as amylase, lipase, and trypsin. Additionally, secretin inhibits the release of gastrin from the stomach, which in turn reduces gastric acid secretion.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because secretin does not stimulate the release of gastrin from the stomach. Instead, it inhibits gastrin release.
* **Option B:** This option is incorrect because secretin does not stimulate the release of insulin from the pancreas. Insulin is released in response to high blood glucose levels, not in response to secretin.
* **Option C:** This option is incorrect because secretin does not stimulate the release of aldosterone from the adrenal glands. Aldosterone is a hormone that regulates electrolyte balance and blood pressure, not pancreatic or bile duct secretions.
**Clinical Pearl / High-Yield Fact**
Secretin is often used as a diagnostic tool to assess pancreatic function. During a secretin stimulation test, secretin is administered intravenously, and pancreatic juice is collected to measure bicarbonate and enzyme output.
**Correct Answer: A. This option is incorrect because secretin does not stimulate the release of gastrin from the stomach.**