CSI Commercial Training and Development Practice Test

Preservation of biological material at extremely low temperatures using slow cooling or rapid vitrification is cryopreservation. This method stops biological activity long enough to store cells, embryos, sperm, or tissues for future use, with slow freezing gradually reducing temperature and forming small ice crystals, while vitrification cools so quickly that the material becomes a glass-like solid with no ice crystals, minimizing damage. Other terms listed don’t describe this process: Corona Radiata cells are the cell layer around the oocyte, congenital anomalies are birth defects, and clinical pregnancy rate is a measure of pregnancy outcomes.