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.
Before pregnancy, your cervix â the lower part of the uterus that connects to the vagina â is normally closed and rigid. During pregnancy, your cervix will gradually soften, decrease in length (efface) and open (dilate) as your baby grows and you prepare to give birth.