Final answer:
The structure leading from the urinary bladder to the outside of the body is the urethra, which is responsible for urine excretion during urination.The correct option is B.
Step-by-step explanation:
The structure that leads from the urinary bladder to the outside of the body is the urethra. After urine forms in the kidneys, it travels through the ureters, enters the bladder for storage, and is eventually excreted during urination.
The urethra is a muscular tube responsible for transporting urine from the bladder to be discharged from the body.
Female and male urethras have anatomic differences, but both function in the excretion of urine. Therefore, the correct answer is b. Urethra.