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.
include nose, pharynx, larynx, trachea, bronchi, bronchioles and terminal bronchioles, their function is to filter, warm, and moisten air and conduct it into the lungs respiratory zone-consists of tissues within the lungs where gas exchange occurs.tructure of upper respiratory system. conists of two parts: upper respiratory system-includes nose, pharynx, and associated structures lower respiratory system-includes larynx, trachea, bronchi, and lungs.