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microorganisms from outside the body may infect the urinary system causing, for example, CYSTITIS

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Substances in the urine form crystals that must be released though:
natural expulsion: with pain
external shock waves

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when the kidneys cant remove the waste products the individual may receive two tratament:
haemodialysis: the patient is connected to a machine that works as a kidney
kidney transplant: difinitive solution

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excretion: eliminate waste products from the blood, through structures called NEPHRONS, that contains:
bowman¨s capsule, tubule and collecting ducts.

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The urinary system is formed of:
two kidney: the cortex, the medula, the blood vessels
two ureters: narrow  tubes that connect the kidney with the bladder.
a bladder: structure that stores urine.
a urethra: tube that connect the bladder to the outside of the body

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Yellow liquid that is formed of water (95%) and substance dissolved (5%)

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organ where the urine is produced. he kidney is formed of:
THE CORTEX: external layer.
THE MEDULLA: internal layer.
THE BLOOD VESSELS: one artery and one vein.