Which tube connects the bladder to the outside of the body for urine excretion?

The urethra is the tube that serves the crucial function of connecting the bladder to the outside of the body, allowing for the excretion of urine. This structure plays a vital role in the urinary system, as it is responsible for transporting urine that has been stored in the bladder until the body is ready to eliminate it.

The urethra is distinct from other structures mentioned in the choices. For instance, the ureter carries urine from the kidneys to the bladder, and the fallopian tube is part of the female reproductive system, involved in transporting ova from the ovaries to the uterus. The vas deferens is associated with the male reproductive system, carrying sperm from the testes to the urethra. Therefore, the key distinguishing feature of the urethra is its direct function in urine excretion, emphasizing its role as the exit route for urine from the bladder to the outside environment.