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Renal system - Coggle Diagram
Renal system
Function
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The sphincter is a ring of muscle that keeps the bladder tightly closed and connects the bladder to the urethra
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The kidneys
Kidneys receive their blood supply from the arteries, branching directly from the aorta. Inside the kidney the renal arteries gradually become smaller, ending in small capillaries called glomeruli. Each kidney has about 1 million nephrons which pass the filtered blood through to long tubules and into the central part of the kidney called the medulla.• Each kidney is surrounded by a layer of fibrous tissue and then embedded in fat, which acts as a shock absorber and helps to prevent injury.
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Ureters
The ureters are the two tubes that transport urine from the kidneys to the bladder. Each ureter is about 25-30cm long.• Urine passes along the ureters mainly by gravity, but also due to peristaltic movements in the walls of the ureters, which occurs several times a minute. The ureters enter the bladder through a tunnel which is angled to prevent reflux of urine when the bladder contracts.
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Kidneys filter all your blood roughly every 45 minutes.• This means they filter 150litres of blood each day.• They produce around 1.5 litres of urine per day.
The urinary bladder is a hollow muscular organ that lies in the pelvic cavity.• It acts as a reservoir for urine, with an adult bladder holding half a litre or more of urine.The bladder walls are muscular.• The urethra carries urine from the bladder to the outside. The opening into the urethra is at the bladder's lowest point and is kept closed by the sphincter