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.
By Mayo Clinic Staff. If you're considering taking birth control pills, you're not alone. Birth control pills are some of the most popular contraceptives. And for good reasons â they're effective and easy to use. The variety of birth control pills available, though, can seem daunting.