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

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

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The kidneys are bean-shaped organs located on the earlier of the abdominal wall, behind the peritoneum. The appropriate kidney sit slightly lower than the left come accommodate the liver. The kidneys filter blood (supplied through the renal arteries) to eliminate unwanted substances. They additionally 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, slim tubes made of smooth muscle. Contractions of the smooth muscle press urine down v the ureters and into the bladder. In adults, the ureters are 25–30 centimeter long, around the size of a 12-inch ruler.

3. The Urinary Bladder Is a Reservoir for Urine

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Urine flows with the ureters into the urinary bladder. In women, the bladder is located in former of the vagina and also below the uterus. In men, the bladder sit in prior of the rectum and above the prostate gland. The wall surface of the bladder consists of folds dubbed rugae, and also a great of smooth muscle called the detrusor muscle. As urine filling the bladder, the rugae smooth out 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 around two cups.

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

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Urine produced in the kidney passes v the ureters, collects in the bladder, and also is then excreted v the urethra. In females, the urethra is narrow and about 4 centimeter long, significantly much shorter than in males. That extends from the bladder neck to the external urethral orifice in the vestibule the the vagina.