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.
Birth control pills. Birth control pills, also known as oral contraceptives, have been marketed in the United States since 1962. Over the past 40 years, there have been changes in the types of estrogen and progestin (hormones) used in the pills and lower amounts of hormones overall.According to the Centers for Disease Control and Prevention, the birth control pill is the leading birth control method used by women younger than 30 years.rogestin-only pills, also known as the mini-pill, are not used widely in the United States. Fewer than 1% of users of oral contraceptives use them as their only method of birth control. Those who use them include women who are breastfeeding and women who cannot take estrogen.