Quick Answer. The function of the cartilaginous rings of the trachea is to stabilize the trachea and keep it rigid while allowing the trachea to expand and lengthen when the person breathes. If the trachea was not supported in this way, it would simply collapse because of the pressure of the chest.
1 The Pill. The pill is the common name for oral contraception. It's one of the safest, most effective, and popular methods of birth control. The pill is made up of synthetic forms of hormones that naturally occur in a female's body - progestin and estrogen.
Since the pill was approved by the FDA in 1960, oral contraceptives have become one of the most popular forms of birth control used today. Millions of women are prescribed the pill each year in this country, but very few are aware that oral contraceptives are a common trigger of hair loss for many who use them.