Assistant principals aid the principal in the overall administration of the school. Some assistant principals hold this position for several years to prepare for advancement to principal jobs; others are career assistant principals.n larger school systems, a principal is often assisted by someone known as a vice-principal (Republic of Ireland: deputy principal) or assistant principal.
Causes. Pressure on the bladder during delivery is the main cause of a ruptured bladder, although a weakness in the bladder wall may make it susceptible to a rupture. In older horses, a ruptured bladder may be caused by an accident or related to a urinary obstruction.
Here is a brief summary of some of the causes of pain from the kidneys or bladder:-. 1  Infection is the commonest. A bacterium (bug) grows in the urine. 2  Kidney stones. These are small lumps of, usually, chalky material in the kidney, which can cause pain in the kidney. 3  Loin pain haematuria syndrome.