Correct pathway for passage of urine is

Options

A. Renel cortex `to` Medulla `to` Urinary bladder `to` Urethra
B. Renal vein `to` Urethra `to` Bladder `to` Ureter
C. Collecting duct `to` Ureter `to` Bladder `to` Urethra
D. Pelvis `to` Medulla `to` Urinary bladder `to` Urethra

Answer

To determine the correct pathway for the passage of urine, we can break down the process step by step:

### Step-by-Step Solution:

1. **Formation of Urine**:
- Urine is formed in the nephron, which is the structural and functional unit of the kidney.

2. **Collection of Urine**:
- Once urine is formed in the nephron, it is collected in the **collecting ducts**.

3. **From Collecting Ducts to Calyx**:
- The collecting ducts then lead to the **renal calyx**. The calyces are cup-shaped structures that collect urine from the collecting ducts.

4. **Entry into Renal Pelvis**:
- The calyces converge to form the **renal pelvis**, which is the funnel-shaped structure that collects urine from the calyces.

5. **Transport through Ureters**:
- From the renal pelvis, urine enters the **ureters**. The ureters are tubes that transport urine from the kidneys to the urinary bladder.

6. **Storage in Urinary Bladder**:
- The ureters lead to the **urinary bladder**, where urine is stored until it is ready to be excreted.

7. **Passage through Urethra**:
- When it is time to urinate, urine exits the bladder through the **urethra**, which is a long tube that connects the urinary bladder to the external environment (urinary meatus).

8. **Excretion**:
- Finally, urine is expelled from the body through the urethra.

### Correct Pathway:
The correct sequence for the passage of urine is:
**Collecting Duct → Renal Calyx → Renal Pelvis → Ureter → Urinary Bladder → Urethra**.