Urinary bladder opens to the outside through

Options

A. Nephron
B. Glomerulus
C. Ureter
D. Urethra

Answer

To solve the question "Urinary bladder opens to the outside through," we need to analyze the options provided:

1. **Nephron**: The nephron is the functional unit of the kidney responsible for filtering blood and forming urine. It does not connect the urinary bladder to the outside.

2. **Glomerulus**: The glomerulus is a network of capillaries located within the nephron. It is involved in the filtration of blood but is also not involved in the connection between the urinary bladder and the outside.

3. **Ureter**: The ureter is a tube that carries urine from the kidneys to the urinary bladder. While it plays a role in the urinary system, it does not open to the outside.

4. **Urethra**: The urethra is the tube that carries urine from the urinary bladder to the outside of the body. This is the structure that connects the urinary system to the external environment.

Based on this analysis, the correct answer to the question is:

**Urethra**

### Step-by-Step Solution:
1. Identify the function of each option provided.
2. Determine which structure is responsible for connecting the urinary bladder to the outside of the body.
3. Conclude that the urethra is the correct answer.