MCAT Content / Excretory System / Storage And Elimination Ureter Bladder Urethra

Storage and elimination: ureter, bladder, urethra

Topic: Excretory System

The urine formed in the collecting duct of the nephron moves to the ureter and then to the bladder. It oos stored in the bladder and is excreted via the urethra.

The urine formed in the nephrons of the kidney moves out from the kidney via the ureter. The urine moves through the ureter down towards the urinary bladder. The walls of the urinary bladder are formed of a transitional epithelium that helps to increase the size; thus, the capacity of the urinary bladder. This epithelium is stretchable. The urine is stored here for some time. The urine is excreted via the urethra outside the body from the urinary bladder.

Key Points

• Urine moves from the collecting duct of the nephron to the ureter and then to the urinary bladder.

• The urine is stored in the urinary bladder that increases in size when it gets filled with the urine due to the presence of the transitional epithelium in its walls.

• The urine is excreted from the urinary bladder via the urethra.

Key Terms

ureter: a tube that transports urine from the kidney to the urinary bladder

transitional epithelium: a type of epithelium in which the cells can expand and relax thus can help to increase and decrease the size of the organ

nephron: structural and functional unit of the kidney

bladder: a hollow muscular organ that collects and stores urine

urine: a nitrogenous waste product

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