The respiratory system is divided into four components: the upper respiratory system, lower respiratory system, chest wall and diaphragm. Upper respiratory system: The upper respiratory system comprises all structures and passages involved in the conduction of air from outside the body to the larynx. This system includes the nose, mouth and structures within the hypopharynx.
There are two fundamentally different types of laser eye surgery: PRK and LASIK. Under these two categories, there are several different flavors or modifications of each type.For example, LASEK (with an E) is a newer type of PRK.here are two fundamentally different types of laser eye surgery: PRK and LASIK. Under these two categories, there are several different flavors or modifications of each type.
Cataract surgery is the most commonly performed type of eye surgery. In the vast majority of cases, approximately 95% of the time, the surgery is uncomplicated. Cataract surgery usually results in improved vision and a well satisfied patient. However, cataract surgery should never be trivialized.In a small percentage of patients, events occur which can lead to less than ideal results.n the vast majority of cases, approximately 95% of the time, the surgery is uncomplicated. Cataract surgery usually results in improved vision and a well satisfied patient. However, cataract surgery should never be trivialized.