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.
A number of premature births take place because of a painless stretching of the cervix. A long cervix during pregnancy could be caused by traumatic circumstances that have had their effect on the cervix at an earlier time. Medical procedures, such as a dilatation and curettage are responsible for affecting the cervix.