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.
Here are some of the most common questions we hear women ask about the pill. We hope you find the answers helpful. Birth control pills are a kind of medicine with hormones that you take every day to prevent pregnancy. There are many different brands of pills. The pill is safe, affordable, and effective if you always take it on time. Besides preventing pregnancy, the pill has lots of other health benefits, too.