Which term refers to preserving reproductive materials at very low temperatures by slow freezing or vitrification?

Which term refers to preserving reproductive materials at very low temperatures by slow freezing or vitrification?

• A. Corona Radiata cells
• B. Cryopreservation
• C. Congenital anomalies
• D. Conventional in vitro insemination

Answer: (B)

Preserving reproductive materials at very low temperatures by slow freezing or vitrification is known as cryopreservation. This process keeps sperm, eggs, embryos, or ovarian tissue viable for future use by stopping biological activity through freezing. Slow freezing uses a controlled cooling rate with cryoprotectants to minimize ice crystal formation, while vitrification uses ultra-rapid cooling with high concentrations of cryoprotectants to create a glass-like solid without ice crystals. These methods are specifically about storage rather than active fertilization, which is why cryopreservation is the correct term. The other options don’t describe the storage process: corona radiata cells are part of the egg’s surrounding structure, congenital anomalies are birth defects, and conventional in vitro insemination refers to IVF procedures, not long-term preservation.

Preserving reproductive materials at very low temperatures by slow freezing or vitrification is known as cryopreservation. This process keeps sperm, eggs, embryos, or ovarian tissue viable for future use by stopping biological activity through freezing. Slow freezing uses a controlled cooling rate with cryoprotectants to minimize ice crystal formation, while vitrification uses ultra-rapid cooling with high concentrations of cryoprotectants to create a glass-like solid without ice crystals. These methods are specifically about storage rather than active fertilization, which is why cryopreservation is the correct term. The other options don’t describe the storage process: corona radiata cells are part of the egg’s surrounding structure, congenital anomalies are birth defects, and conventional in vitro insemination refers to IVF procedures, not long-term preservation.