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.
Answered by The Community. Making the world better, one answer at a time. The epithelium and blood vessels in the nasal cavity serve to warm and moisturize the air as a person breathes it in. This is to prevent the delicate membranes of the alveoli from being damaged by cold dry air.