The mammalian excretory system involves all of the following except:

Options

A. reabsorption of high molecular weight proteins from the glomerular filtrate
B. active transport of chloride ions from the filtrate into the peritubular tissues
C. release of nitrogenous wastes into the intestines
D. hormonal control of permeability of walls in various excretory tubules

Explanation

To solve the question regarding the mammalian excretory system and identify which statement is incorrect, we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Excretory System**:
- The mammalian excretory system primarily consists of the kidneys, ureters, urinary bladder, and urethra. The functional unit of the kidney is the nephron, which is responsible for filtration, reabsorption, and secretion of waste products.

2. **Analyzing Option A**:
- **Statement**: "Reabsorption of high molecular weight proteins from the glomerular filtrate."
- **Evaluation**: This statement is incorrect. Normally, high molecular weight proteins are not reabsorbed from the glomerular filtrate because they are too large to pass through the filtration barrier in the glomeruli. Therefore, this statement is not true in the context of normal mammalian excretory function.

3. **Analyzing Option B**:
- **Statement**: "Active transport of chloride ions from the filtrate into peritubular tissues."
- **Evaluation**: This statement is correct. Active transport mechanisms are indeed used to move chloride ions from the filtrate into the surrounding peritubular tissues to maintain ionic balance.

4. **Analyzing Option C**:
- **Statement**: "Release of nitrogenous waste into intestine."
- **Evaluation**: This statement is incorrect. In mammals, nitrogenous wastes (like urea) are primarily excreted through urine and not released into the intestine. Thus, this statement is also not true.

5. **Analyzing Option D**:
- **Statement**: "Hormonal control of permeability of walls in various excretory tubules."
- **Evaluation**: This statement is correct. Hormones such as ADH (Antidiuretic Hormone) and aldosterone play significant roles in regulating the permeability of the nephron tubules, affecting water and sodium reabsorption.

6. **Conclusion**:
- After evaluating all the options, we find that the incorrect statements regarding the mammalian excretory system are A and C. However, since the question asks for one statement that is incorrect, we can conclude that **Option C: "Release of nitrogenous waste into intestine" is the most clearly incorrect statement**.

### Final Answer:
**Option C: Release of nitrogenous waste into intestine.**

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