Objectives:<br />Describethe parts and functions of the urinary system.<br />Explain how the kidneys filter blood.<br />Describe three disorders of the urinary system.<br />
Cleaning the Blood<br />The urinary system contains the organs that remove waste products from your blood.<br />
The Kidneys as Filters<br />Kidneys<br />Pair of organs in the urinary system that clean the blood and excrete products as urine. <br />Inside each kidney are more than 1 million microscopic filters called nephrons.<br />
Water In, Water Out<br />Sweat and Thirst <br />The evaporation of water sweat cools you down.<br />As the water content of the blood drops, the salivary glands produce less saliva, resulting in thirst.<br />Antidiuretic Hormone <br />When you get thirsty, antidiuretic hormone is released. <br />This hormone signals the kidneys to take water from the nephronsand return it to the body.<br />Diuretics <br />Cause the kidneys to make more urine, which decreases the amount of water in the blood.<br />Example: beverages containing caffeine<br />
Urinary System Problems<br />Bacterial Infections <br />Bacteria can get into the bladder and uretersthrough the urethra and cause painful infections.<br />Kidney Stones<br />Salts and other wastes can collect inside the kidneys and form kidney stones.<br />Kidney Disease<br />Damage to nephrons can prevent normal kidney functioning and can lead to kidney disease.<br />
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