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.
Chapter 22 RESPIRATORY TRACT. The tract rhythmically expels spent air and takes in fresh through conditioning passages, conducting it to the respiratory portion of the lungs, where the walls of the air-filled chambers are thin enough to permit an exchange of gases between blood and air.