1 Excretion-Wastes such as excess water, salt, urea and uric acid are removed from the body in sweat. 2  Waterproofing-The skin with its oil glands prevents the entry of water into, and loss of water out of the body. 3  Protection from Disease-The intact skin prevents invasion of micro-organisms and dust into the body.ubes called ureters carry waste products from the kidneys to the urinary bladder for storage or for release. Details of the human excretory system. Position and allied structures of the kidneys (top). A cross section of the kidney showing the two major portions (left).
Each leg has a long sciatic nerve that runs through the buttock, down the back of the thigh, and into the foot and toes. Sciatica is pain felt along the course of those nerves and their branches, so while the problem originates in the lower lumbar region of the spine, the symptoms are felt mainly in the legs. Many people with the condition have a history of back problems, but sciatica often starts suddenly. It can be triggered by something minor â even a sneeze.
Pain management health centre. Sciatica (sciatic nerve pain) - Symptoms, causes, diagnosis, treatment. Sciatica is a common type of pain caused by compression or irritation of the sciatic nerve. The sciatic nerve is the longest nerve in the body, going from the pelvis, through the buttocks, down the legs to the feet. Having a prolapsed disc (also known as a slipped disc) in the back is a most common cause of sciatica, but sometimes doctors do not find an obvious cause of the pain.