Speed ratings on tires are expressed in letters and are generally listed along with the load index for a tire after the size, for instance 245/40R18 93H. 93 is a load index and the H is the speed rating .â¦. What Does Z Mean On The Tires | Zr Speed Rated | Zr Rating. 1  Differences in Tire Speed Ratings Explained.
Effacement: Thinning of the cervix. In the last month of pregnancy the cervix will begin to stretch and thin. This is an indication that the lower portion of the uterus is getting prepared for delivery, as a thinner cervix dilates more easily. Your health care provider can check for effacement in the final two months of pregnancy.
During childbirth, the cervix thins out and eventually dilates (expands) to 10 centimeters to allow the baby to pass through the birth canal. Once the baby is born and the placenta is expelled, the cervix begins to thicken and close. Cancer sometimes develops in the cervix of uterus. Dysplasia is a fully treatable pre-cancer condition of the cervix diagnosed via a pap smear. If dysplasia isn't diagnosed and treated, cervical cancer, which is usually caused by the human papilloma virus, begins to spread.