Bladder is a human organ.

The bladder is an organ that stores urine in the human body. It is an important organ in the urinary system. The

bladder is located in the pelvis, connected to the ureter at the top and to the urethra at the bottom. It is mainly elliptical and has certain flexibility. The structure of the bladder includes mucosa, muscle layer, serosa layer, etc. In most cases, it is composed of smooth muscle and has the function of storing urine. The function of the bladder is regulated by the nervous system. Through the regulation of the sympathetic nerve and parasympathetic nerve of the autonomic nervous system, the contraction and relaxation of the bladder are coordinated to achieve urination.