Which of these digestive enzymes is NOT present in pancreatic juice?
**Core Concept**
The digestive enzymes present in pancreatic juice play a crucial role in breaking down carbohydrates, proteins, and fats into smaller molecules that can be absorbed by the body. Pancreatic juice contains a variety of enzymes, including amylases, lipases, and proteases, which are secreted by the pancreas into the small intestine to facilitate digestion.
**Why the Correct Answer is Right**
The presence of certain enzymes in pancreatic juice is essential for proper digestion. Amylase, lipase, and trypsin are all key enzymes that facilitate the breakdown of carbohydrates, fats, and proteins, respectively. However, one enzyme is not present in pancreatic juice, and that is **gastric amylase**, also known as pepsinogen. Pepsinogen is secreted by the stomach and is activated to pepsin in the acidic environment of the stomach, where it breaks down proteins. The pancreas does secrete amylase, but it's secreted as salivary amylase in the mouth and pancreatic amylase in the pancreas. However, the correct answer here is actually **D. Gastric amylase** but the correct answer is actually **D. Pepsin**.
**Why Each Wrong Option is Incorrect**
**Option B:** While gastric amylase is not present in pancreatic juice, it's actually not the correct answer here. The correct answer is actually **D. Pepsin**.
**Option C:** This option is not correct because it's actually **Pepsinogen** that is secreted by the stomach and not **Pepsinase**.
**Clinical Pearl / High-Yield Fact**
Pepsinogen is secreted by the chief cells of the stomach and is activated to pepsin in the acidic environment of the stomach, where it breaks down proteins into smaller peptides.
**Correct Answer:** D. Pepsin