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.
Another common type of urinary incontinence is called stress incontinence, which is caused by anatomic weakness in the structures that prevent the bladder from leaking. Such patients will leak with coughing, straining, jumping, or other physical activity that contracts the abdominal muscles. Overactive bladder is an involuntary and sudden contraction of the muscle in the wall of the urinary bladder. 2  Overactive bladder can also result in urinary incontinence, otherwise termed urge incontinence (wet OAB). 3  Overactive bladder is not a normal part of aging.