What is the name of the tube that connects the urinary bladder to the external body?

The tube that connects the urinary bladder to the external body is known as the urethra. Its primary function is to serve as a conduit for urine to exit the body during urination. The urethra is a crucial part of the urinary system, allowing the bladder, which stores urine, to effectively expel waste fluid from the body.

The urethra varies in length and structure between males and females; in males, it is longer and also carries semen, whereas in females, it is shorter and exclusively used for the excretion of urine. This anatomical distinction highlights the pivotal role that the urethra plays in the urinary function.

Other structures mentioned, such as the ureter, which transports urine from the kidneys to the bladder, and the vas deferens, which carries sperm from the epididymis to the ejaculatory duct, serve different functions and are not involved in the direct elimination of urine. The fallopian tube is associated with the female reproductive system, facilitating the transport of eggs from the ovaries to the uterus. Thus, the urethra is the only correct answer that directly connects the bladder to the external body for urinary excretion.