| A | B |
|---|
| zygote | a united egg and sperm |
| embryo | the name of the structure from the two-cell stage until about nine weeks after fertilization |
| blastocyst | the structure, made of up 50 to 100 cells surrounding a hollow center |
| implantation | the process of a blastocyst attaching itself to the call of the uterus |
| amniotic sac | a fluid-fileld bad of thin tissue that develops around the embryo |
| placenta | the attachment holding the embryo to the wall of the uterus; oxygena nd nutrients move from the mother to the embryo |
| umbilical cord | a ropelike structure that develops between the embryo and the placenta about 25 days after fertilization; the embryo's lifeline |
| fetus | the developing human from the third month until birth |
| prenatal care | medical care during pregnancy |
| obstetrician | a doctor specialized in pregnancy and childbirth |
| trimester | three periods of pregnancy; each approximately 3 months long |
| ultrasound | high frequency sound waves used in most pregnancies to create an image of the developing fetus |
| chorionic villus sampling | test performed around the 8th week of pregnancy to detect inherited disorders; only done when risk factors are present |
| amniocentesis | test performed around the 14th-16th week of pregnancy to detect abnormalities in the amniotic fluid; only performed when risk factors are present |
| ectopic pregnancy | the blastocyst implants in the fallopian tube or elsewhere in the abdomen instead of in the uterus |
| miscarriage | the death of an embryo or fetus in the first 20 weeks of pregnancy |
| preeclampsia | also known as toxemia; characterized by high blood pressure, swelling of the wrists and ankles, and high levels of protein in the urine |
| gestational diabetes | diabetes that develops in pregnant women; marked by high blood sugar levels |
| certified nurse-midwife | a nurse who is trained to deliver babies |
| labor | the work performed by the mother's body to push the fetus out |
| postpartum period | the first six weeks after childbirth |
| stillbirth | occurs when a fetus dies and is expelled from the body after the 20th week of pregnancy |
| cesarean section | a surgical method of birth |
| premature birth | delivery of a baby before the 37th week of pregnancy |
| low birthweight | a newborn that weighs less than 5.5 pounds at birth |
| multiple birth | the delivery of more than one baby; i.e. twins, triplets |
| pre-adolescene | the "tween" years; late childhood or ages 9-12 |
