Answer:
There are air filters to purify the air and water filters to clean the water. Well, the kidneys are like a filtering system, too. They contain nephrons, which filter waste from the blood in two stages. First, nephrons take waste as well as needed materials out of blood. Then, the materials the body needs (like water and glucose) are returned to the blood and wastes are eliminated from the body. This is one way the kidneys maintain homeostasis. The kidneys also regulate the amount of water in the body. The amount of water the kidneys return to the blood depends on the conditions inside and outside of the body. This is another way the excretory system maintains homeostasis. For example, you will make more urine on a cool day when you have drunk a lot of water than you will on a hot day when you've hardly had anything to drink.
(I answered a question similar to this some time ago so you might also find it there.) Hope It Helps!
Protein
Fat
Minerals
Water
Carbohydrates
Vitamins
A systemic lupus erythematosus (SLE) is a condition whereby the immune system attacks the body, confusing it with something foreign. When this patient complains that his hands become pale, blue and painful when exposed to cold, the disease that the nurse should cite in as an explanation for these signs and symptoms is Raynaud's disease. This disease causes areas of your body to numb whenever someone has stress on in the events of being exposed to extreme cold temperatures. The blood vessels narrows and limiting the blood circulation to the affected areas. This effect is called vasospam.
