Cervix - located between the vagina and uterus, the cervix serves as a passageway for menstrual blood on the way out, and semen on the way in.
Chemical pregnancy - a pregnancy that is only confirmed by elevated hCG hormone levels in the blood. Usually, the term chemical pregnancy is used to describe a very early miscarriage that occurs before ultrasound was able to see a gestational sac or heartbeat.
Clinical pregnancy - a pregnancy that is confirmed by both high levels of hCG hormone and ultrasound confirmation of a gestational sac or heartbeat. It is opposed to a chemical pregnancy, which is only confirmed by elevated levels of hCG but ends in miscarriage before ultrasound confirmation can take place.
Corpus Luteum - after an egg has matured and been ovulated from the follicle, the empty follicle becomes a corpus luteum. The corpus luteum secretes the hormones required to prepare the body for the possibility of conception.
If conception does not take place, the corpus luteum diminishes, leading to a drop in the hormone levels. This drop then leads to menstruation.
Cryopreservation - is the process of preserving tissue by freezing it with liquid nitrogen. Cryopreservation may be used to preserve eggs, sperm, embryos, or ovarian tissue for later use.