Excretory
Homeostasis
Homeostasis is the maintenance of a constant internal environment. This occurs in the red foxes body in many place to inhale nutrients, exhale gases and liquids, excrete waste and sweat liquid all to maintain temperature and clean body as well as provide nutrients. The six body levels that need to be controlled are removal of CO2, removal of urea, iron content, water content, sugar content and temperature.
Removal of Waste
There are three main ways the red fox removes of its waste.
Lungs
In the respiration system oxygen is taken in through the mouth, trachea, bronchius, bronchiols and alveoli but carbon dioxide and water are also expelled from the foxes body by traveling in reverse. Water and carbon dioxide are the bi-products of sugar and oxygen making energy and need to be expelled from the body. The veins bring the carbon and water vapor back to lungs and they send it back up until it is exhaled. Human's respiration system also works in the same way and because of the water vapor in breath is why glass will fog up when breathed on.
Temperature control
Another medium for removing waste in the red foxes body is the skin. The skins excretes waste by secreting liquid water from it's glands but because of the lack of area where there is only skin and no hair the red fox also has another medium to cool body temperature which is called panting. This is done by heavy quick breathing which enables the fox to have more oxygen to cool down the body. Another way the red fox can cool it's body temperature is by going for a swim in a nearby lake.
Kidneys
The kidneys are a vital organ in any mammals body which separate and get rid of the the waste. The kidneys also control blood pressure by producing a hormone called renin. Each day the kidney process around 200 litres of blood using a specialised cell called nephrons. These nephrons are located in each of the renal pyramids located in the kidney.
The blood starts by entering a network of capillaries called the glomerulus that are inside a cup shaped part called the Bowmans Capsule. The impurities or excess fluid are then filtered out the the miniscule holes in the Bowmans Capsule that are big enough to fit imputies cells but not red blood cells. After this the excess liquid and impurites travel though the swerving pipe of the nephron while the clean blood travels back into the system through the the network of capillaries in which it came. Once the urea reaches the end of the nephron it the travels out via the renal pelvis to the ureter to become urine.