Question

which of the following extends from the urinary bladder to an external opening? a urethra b hilum c ureters d trigone

Explanation:

To solve this, we analyze each option:

• Option A: The urethra is the tube that carries urine from the urinary bladder to the external opening (urethral meatus) for excretion.
• Option B: The hilum is a part of organs (like kidneys) where blood vessels and nerves enter/exit, not related to bladder to external opening.
• Option C: Ureters carry urine from kidneys to the bladder, not from bladder to external opening.
• Option D: The trigone is a triangular area in the bladder, not a tube extending to an external opening.

So, the correct answer is A as the urethra matches the description.

Answer:

A. Urethra