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.
Throughout your pregnancy your cervix has been tightly closed and protected by a plug of mucus. As the babyâs head drops down into the pelvis, it pushes against the cervix and causes the cervix to relax and thin out, or efface. When the cervix effaces, the mucus plug is loosened and passes out of the vagina.