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 nasal cavity has four functions: 1  Warms and humidifies the inspired air. 2  Removes and traps pathogens and particulate matter from the inspired air. 3  Responsible for sense of smell. 4  Drains and clears the paranasal sinuses and lacrimal ducts.