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.
The birth control pill, often referred to as the pill, is a form of birth control used by women that is taken by mouth. When taken correctly, it is 98% effective. However, because many women do not take it correctly, on average about 9% of women have an unintended pregnancy each year while on the pill.