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The kidneys, ureters, bladder, and also urethra space the primary structures of the urinary system. They filter blood and remove waste from the body in the form of urine. The size and position of lower urinary structures vary v male and also female anatomy.

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1. Kidneys Filter Blood at the height of the Urinary System

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The kidneys room bean-shaped organs positioned on the ago of the ab wall, behind the peritoneum. The appropriate kidney sit slightly lower than the left to accommodate the liver. The kidney filter blood (supplied through the renal arteries) to remove unwanted substances. They also secrete waste right into the urine.

2. The Ureters relocate Urine from the kidneys to the Bladder

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Urine drains native the renal pelvis of each kidney into the ureters. The ureters are long, thin tubes do of smooth muscle. Contractions the the smooth muscle press urine down through the ureters and into the bladder. In adults, the ureters room 25–30 cm long, around the length of a 12-inch ruler.

3. The Urinary Bladder Is a Reservoir because that Urine

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Urine flows with the ureters into the urinary bladder. In women, the bladder is located in prior of the vagina and below the uterus. In men, the bladder sit in former of the rectum and over the prostate gland. The wall surface of the bladder consists of folds referred to as rugae, and also a class of smooth muscle referred to as the detrusor muscle. As urine fills the bladder, the rugae smooth out to accommodate the volume. The detrusor relaxes to host the urine, then contracts because that urination. One adult bladder is complete at about fifty percent a liter, or around two cups.

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4. The female Urethra Is much shorter Than the masculine Urethra

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Urine created in the kidneys passes through the ureters, collection in the bladder, and is then excreted through the urethra. In females, the urethra is small and around 4 centimeter long, significantly shorter than in males. That extends from the bladder neck to the exterior urethral orifice in the vestibule of the vagina.