What is the cervix?
The opening to the uterus
What is the internal os?
The opening of the cervix into the uterus
What is the external os?
The opening of the cervix into the vagina
What do progesterone only pills do to cervical mucus?
Thicken it
How does the epithelium change through the cervix?
Squamous at the internal os and becomes stratified at the external os