select the incorrect statement regarding human excretory system

Options

A. urothelium forms the internal lining of urinary bladder
B. neck region of urinary bladder processes two sphincters, involuntary internal sphincter and voluntary external sphincter
C. in both male and female urethra acts as urinogenital duct
D. kidneys are retroperitoneal in position

Answer

To solve the question regarding the incorrect statement about the human excretory system, we will analyze each option provided.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- **Statement:** "Ureothelium forms the internal lining of the urinary bladder."
- **Analysis:** Ureothelium (also known as transitional epithelium) indeed lines the urinary bladder and allows it to stretch as it fills with urine. This statement is **correct**.

2. **Analyze the Second Statement:**
- **Statement:** "Neck region of urinary bladder possesses two sphincters."
- **Analysis:** The urinary bladder has an internal sphincter (involuntary) and an external sphincter (voluntary) at its neck. This allows for control over urination. This statement is also **correct**.

3. **Analyze the Third Statement:**
- **Statement:** "In both male and female, urethra acts as urogenital ducts."
- **Analysis:** This statement is **incorrect**. In males, the urethra serves as both a urinary and reproductive duct (urogenital duct), carrying urine and semen. In females, the urethra only carries urine; the reproductive system has a separate pathway for gametes (the vagina). Therefore, the urethra in females does not function as a urogenital duct.

4. **Analyze the Fourth Statement:**
- **Statement:** "Kidneys are retroperitoneal in shape."
- **Analysis:** The kidneys are indeed located behind the peritoneal cavity, making this statement **correct**.

5. **Conclusion:**
- After analyzing all statements, the **incorrect statement** regarding the human excretory system is the third one: "In both male and female, urethra acts as urogenital ducts."

### Final Answer:
The incorrect statement regarding the human excretory system is: **"In both male and female, urethra acts as urogenital ducts."**

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