The urinary system
- The kidneys filter the blood to remove some of the water and waste from the body.
- This filtration process produces urine, a mixture of water and nitrogen waste (urea and uric acid).
- The urine flows through tubes (ureters) to the bladder, a bag made of muscle membrane. It collects there until there is enough liquid to make you feel that you need to urinate.
- the detrusor (bladder wall muscle), which contracts to stimulate urination;
- the sphincters (circular muscles), which close off the bladder and stop urine flowing through the urethra. They relax to allow urination to take place.
- the bladder, to contract and push the urine out;
- the sphincters and the pelvic floor muscles, to relax enough to allow the bladder to be emptied through the urethra tube.
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