The Excretory System
By Alex Reyes & Braden Willingham
Nephron (Cell that makes up a kidney)
Nephron Tissue (tissue that makes up a kidney)
The Urinary/Excretory System
The body takes nutrients from food and converts them to energy. After the body has taken the food components that it needs, waste products are left behind in the bowel and in the blood.
The kidney and urinary systems help the body to eliminate liquid waste called urea, and to keep chemicals, such as potassium and sodium, and water in balance. Urea is produced when foods containing protein, such as meat, poultry, and certain vegetables, are broken down in the body. Urea is carried in the bloodstream to the kidneys, where it is removed along with water and other wastes in the form of urine.
Other important functions of the kidneys include blood pressure regulation and the production of erythropoietin, which controls red blood cell production in the bone marrow. Kidneys also regulate the acid-base balance and conserve fluids.
Homeostasis In The Kidney
The renin mechanism of the kidneys works to maintain fluid balance that affects your other organs. However, the kidneys internally work to maintain homeostasis as well. The kidneys filter blood, which contains sodium, potassium and other salts that are necessary for your cells to function. The kidneys maintain this fluid balance by speeding up or slowing the rate at which they filter. If your body needs more fluids, such as when you are dehydrated, the kidneys will take in more fluids and you will urinate less. However, when your body has too much fluid -- such as when you have had a large glass of water to drink -- your kidneys will increase their filtration rate, which causes you to urinate more. This maintains homeostasis by ensuring you have the proper amount of bodily fluids to maintain cell functioning.
The Integumentary System
The Digestive System
Nephron Tissue: http://cache4.asset-cache.net/gc/139812089-human-simple-cuboidal-epithelium-kidney-gettyimages.jpg?v=1&c=IWSAsset&k=2&d=08fcxfxZjBJ26AQSGGc%2ByY75PIxinXNsmr5Hca1lVLXU6DS2olabXRv%2FMvYEL8pF
Nephron Tissue and Kidney Function Info: http://www.healthpages.org/anatomy-function/kidney/
Kidney Homeostasis: http://kidney.templehealth.org/content/fail.htm
Kidney cancer pic: http://www.laparoboticsurgery.com/wp-content/uploads/kidney_cancer.jpg
Kidney cancer: http://www.webmd.com/cancer/understanding-kidney-cancer