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.
1. respiratory bronchioles. 2. alveolar sacs. pulmonary system. -consists of the lungs, airways, chest wall, and pulmonary circulation. -primary function: the exchange of gases between the environmental air and the blood.