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.
1 The cervix is actually a part of the uterus, but made up of different tissue. 2  During pregnancy, the cervix is thick and closed. 3  As you approach the time of birth, your contractions draw the cervix up into the body of the uterus, and it becomes thinner (called effacement) and opens (called dilation). The cervix is actually a part of the uterus, but made up of different tissue. 2  During pregnancy, the cervix is thick and closed. 3  As you approach the time of birth, your contractions draw the cervix up into the body of the uterus, and it becomes thinner (called effacement) and opens (called dilation).