Which organ is part of the urinary system?

The urinary bladder is a key component of the urinary system, which is primarily responsible for the filtration and excretion of waste products from the bloodstream through urine. This organ serves as a reservoir where urine is stored before discharge from the body. It plays a crucial role in regulating fluid and electrolyte balance, as well as maintaining blood pressure.

In contrast, the thymus gland is part of the endocrine and immune systems, involved in the maturation of T lymphocytes. The larynx is part of the respiratory system, responsible for voice production and airflow, while the gallbladder is part of the digestive system, specifically storing bile produced by the liver for fat digestion. Understanding the functions and systems these organs belong to helps clarify why the urinary bladder is the correct choice when identifying an organ associated with the urinary system.