atresia — the process by which an immature follicle degenerates and is reabsorbed by the body

blastocyst — an early-stage embryo containing between 50 and 150 cells; its inner cell mass often serves as the source for embryonic stem cells

capnography — a technique for monitoring the levels of carbon dioxide being inhaled and exhaled, thus giving an indirect measure of blood carbon dioxide levels

clomiphene — a fertility drug that acts by inhibiting the action of estrogen on the pituitary gland, stimulating the gland to release more follicle-stimulating hormone

creatinine — a molecule formed in muscle tissue as a byproduct of the breakdown of creatine phosphate

desaturation — a lowering of the oxygen content of the blood

embryo — the product of a fertilized egg and its ongoing development from the time it implants itself in the uterus (at five to seven days after fertilization) until the eighth week of development, after which it is considered a fetus

embryonic stem cell — a stem cell that can give rise to any type of cell in the body; it is derived from the inner cell mass of a blastocyst, an embryo that is four to five days into development

endometrioma — a cyst in the ovary caused by the presence of endometrial tissue, that is, tissue similar to the lining of the uterus

endometriosis — a medical condition caused by tissue like that of the lining of the uterus (endometrium) being found elsewhere in the body; the symptoms include internal bleeding, inflammation, formation of scar tissue, and interference with the normal functioning of the surrounding tissue

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