Final answer:
The three parts of the cervix are the internal os, cervical canal, and external os. During birth, the cervical canal and the external os become one as the cervix dilates. This process is called cervical effacement.
Step-by-step explanation:
The three parts of the cervix are the internal os, cervical canal, and external os.
During birth, the cervical canal and the external os become one as the cervix dilates.
This process is called cervical effacement.
The axis of the vagina and the axis of the cervix run parallel to each other.