Mixing chemicals with waste in sewage holding tanks or septic. systems may produce toxic fumes, corrode pipelines and tanks, and. pollute soil and ground water when discharged. When chemicals, such as formaldehyde, are added to septic systems, they can cause. bacteria in the system to die.
The cervix is the opening to the womb. Itâs located between the vagina and the uterus and plays a crucial role in pregnancy and labor. During pregnancy, it remains closed and the opening is blocked with a mucus plug.
Other hormones begin to soften your cervix. The cervix is the neck of the uterus, which is closed throughout most of pregnancy, holding the baby inside. Much of the work of labor is in opening the cervix to the passage of your baby. However, your cervix may begin to soften, thin, and open even before labor begins. This varies from woman to woman, and from pregnancy to pregnancy.