Which of the following is NOT a part of the urinary system?

The urinary system is comprised of several key components responsible for the production, storage, and excretion of urine, as well as the role of filtering waste from the bloodstream. The bladder, ureters, and urethra are all integral parts of this system. The bladder serves as the storage unit for urine, the ureters transport urine from the kidneys to the bladder, and the urethra is the passage through which urine is expelled from the body.

On the other hand, the apex is not a recognized component of the urinary system. Instead, it typically refers to the top or tip of a structure in medical terminology, such as the apex of the heart or lungs. Therefore, it does not play a role in the functions or anatomy associated with the urinary system. This distinction clarifies that the apex is not involved in the urinary processes that the other components facilitate.