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.
1 Cancers: Kidney and bladder cancers may be associated with blood in the urine. 2  Injury: Trauma to the urinary tract can cause bleeding into the urine. 3  Drugs: Medications including aspirin, heparin, and penicillin can cause hematuria. Nephrolithiasis: Kidney or bladder stones may form inside the urinary tract and can cause bleeding into the urine. 2  Kidney disease: Diseases of the kidney can be associated with blood in the urine. 3  Prostate gland enlargement: Enlargement of the prostate can compress the urethra and partially block the flow of urine.