Understanding the Urinary System
The urinary system plays a crucial role in maintaining the body's fluid balance and expelling waste. Each organ within this system has a specific function.
Key Organs Involved
- Kidneys:
- Function to filter blood, removing waste products and excess substances.
- Produce urine, which contains these waste products.
- Ureters:
- Tubes that transport urine from the kidneys to the urinary bladder.
- They do not help in expelling urine but are essential for its movement.
- Urinary Bladder:
- A muscular sac that stores urine until it is ready to be expelled.
- It contracts to push urine into the urethra during urination.
- Urethra:
- The duct through which urine exits the body.
- Plays a direct role in the expulsion of urine.
Why Option 'C' is Correct
The correct answer is option 'C', the urethra, as it is the organ responsible for expelling urine from the body. Here’s how it works:
- The urinary bladder fills with urine and stretches.
- When it reaches a certain level, nerve signals prompt the bladder to contract.
- This contraction forces urine into the urethra.
- The urethra then opens, allowing urine to exit the body.
Conclusion
While other organs are vital for urine production and transportation, the urethra is the final pathway through which urine is expelled from the body, making it the correct answer to the question. Understanding these functions helps clarify the role of each organ in the urinary system.