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.
The most common types of laser eye surgery include LASIK, PRK, LASEK and EpiLASIK. Each of the four laser eye surgery procedures below uses the same special laser, called an âexcimerâ laser, to reshape the cornea. This is what corrects vision. But laser eye surgery can vary in the specifics of the procedure, the recovery time, which surgical instruments are used and your patient candidacy. You might be a better candidate for PRK, for instance, than for LASIK.