Select the wrong option from the following.

Options

A. Intrinsic factor secreted by parietal cells -Essential for the absorption of vitamins.
B. Bile activities - lipases.
C. Succus entericus - digestion of nucleic acid into nucleotides.
D. Enterokinase secreted by intestinal mucosa - activates trypsinogen into trypsin

Answer

To solve the question, we need to analyze each of the provided options and identify which one is incorrect based on our understanding of human physiology, particularly in relation to digestion and absorption.

### Step 1: Understand the Role of Parietal Cells
Parietal cells are located in the gastric glands of the stomach. They secrete hydrochloric acid (HCl) and intrinsic factor. The intrinsic factor is crucial for the absorption of vitamin B12 in the small intestine.

**Hint:** Remember that intrinsic factor is essential for vitamin B12 absorption.

### Step 2: Analyze Bile and Its Components
Bile is produced by the liver and stored in the gallbladder. It contains bile salts, cholesterol, and phospholipids but does not contain digestive enzymes. Bile salts help emulsify fats and activate lipases, which are enzymes that digest fats.

**Hint:** Bile does not contain enzymes; it aids in fat digestion.

### Step 3: Examine Succus Entericus
Succus entericus, or intestinal juice, is secreted by the brush border cells of the small intestine. It contains various enzymes, including nucleosidases, which act on nucleosides, but the primary enzymes for digesting nucleic acids (DNA and RNA) are nucleases, which are found in pancreatic juice.

**Hint:** Nucleases are responsible for nucleic acid digestion, not nucleosidases.

### Step 4: Evaluate the Role of Enterokinase
Enterokinase is an enzyme secreted by the intestinal mucosa that activates trypsinogen (an inactive form of the enzyme trypsin) into trypsin. Trypsin is a proteolytic enzyme that helps digest proteins.

**Hint:** Enterokinase activates trypsinogen, confirming its role in protein digestion.

### Step 5: Identify the Incorrect Statement
Now, we can summarize the statements:
1. Parietal cells secrete intrinsic factors essential for vitamin B12 absorption - **Correct**
2. Bile contains enzymes and activates lipases - **Incorrect** (bile does not contain enzymes)
3. Succus entericus digests nucleic acids into nucleotides - **Incorrect** (nucleases in pancreatic juice do this)
4. Enterokinase activates trypsinogen into trypsin - **Correct**

The statement that is wrong is the one regarding succus entericus and the digestion of nucleic acids, as it incorrectly attributes the function of nucleases to it.

### Conclusion
The wrong option is related to the digestion of nucleic acids, specifically stating that succus entericus is responsible for this process.

**Final Answer:** The wrong option is the third one regarding succus entericus.