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.
These 10 animal facts will amaze you. 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.
Depending on the type of glaucoma, two basic types of surgeries are available: 1  Filtering Surgery: Trabeculectomy: In a trabeculectomy, a small incision is made in the sclera (the white of the eye). 2  Drainage Device Surgery: Drainage device surgery partially inserts an artificial tube into the eye.