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.
30.1 Respiratory and Circulatory Functions. The respiratory system moves gases into and out of the. blood. â¢ The lungs contain the bronchi, bronchioles, and alveoli. â¢ Millions of alveoli give the lungs a huge surface area. â¢ The alveoli absorb oxygen from the air you inhale.