In the majority of cases, incontinence is caused by a weakening of the pelvic floor muscles that keep the urethra closed. Whenever they lose their elasticity, everyday activities such as laughing, coughing, lifting and running can cause a urine leak.
The respiratory system consists of a group of ducts that are capable of filtering air from the environment before entering the pulmonary system.
The purpose of the nasal cycle is not fully understood but common belief includes: 1  congested passageways (narrow) allow the glands to recharge. 2  congested passageways also are thought to allow for mucus to be removed. 3  constricted passageways (enlarged) allows for improved humidification and easier airflow.