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The kidneys, ureters, bladder, and also urethra space the main structures of the urinary system. Castle filter blood and remove waste indigenous the human body in the type of urine. The size and also position of reduced 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 space bean-shaped organs positioned on the back of the abdominal wall, behind the peritoneum. The best kidney sits slightly lower than the left to accommodate the liver. The kidneys filter blood (supplied by the renal arteries) to remove unwanted substances. They additionally secrete waste into the urine.

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

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Urine drains from the renal pelvis of each kidney right into the ureters. The ureters are long, slim tubes make of smooth muscle. Contractions that the smooth muscle push urine down with the ureters and also into the bladder. In adults, the ureters are 25–30 cm long, about the length of a 12-inch ruler.

3. The Urinary Bladder Is a Reservoir for Urine

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Urine flows with the ureters right into the urinary bladder. In women, the bladder is located in prior of the vagina and also below the uterus. In men, the bladder sits in former of the rectum and above the prostate gland. The wall of the bladder includes folds called rugae, and also a great of smooth muscle called the detrusor muscle. As urine filling the bladder, the rugae smooth the end to accommodate the volume. The detrusor relaxes to host the urine, then contracts for urination. One adult bladder is full at about fifty percent a liter, or about two cups.

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4. The female Urethra Is shorter Than the masculine Urethra

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Urine produced in the kidneys passes with the ureters, collection in the bladder, and is climate excreted with the urethra. In females, the urethra is small and about 4 centimeter long, significantly much shorter than in males. It extends native the bladder neck come the exterior urethral orifice in the vestibule the the vagina.