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 respiratory system is the interface between the organism and the environment that provides the venue for gas exchange to occur. Not only does the respiratory system serves as the gas exchange surface, but it also humidifies, warms or cools, and cleans the air that enters the respiratory tract. Two major divisions of the respiratory system exist: the conducting portion and the respiratory portion. The former is responsible for conduction of gases in and out of the respiratory portion, which is the true exchange surface.