OB quiz 1 Flashcards
Pregnancy lasts….
40 weeks/280 days
Nagele’s rule
Calculate the due date, you subtract 3 months and add 7 days (from the first day of the last menstrual period).
Most critical time in the development of the organ systems and the main external features.
Development of the embryo
Chorion
Becomes the fetal side of the placenta and contains the major umbilical blood vessels that branch out over the placenta
Amnion and amniotic cavity
Amnion becomes the covering of the umbilical cord and covers the chorion on the fetal surface of the placenta
Amniotic fluid
- helps maintain constant body temperature
- cushions fetus from trauma
- Allows freedom of movement for development of musculoskeletal system
- Keeps the fetus from getting entangled in the membranes
- And serves as a source of fluid and a repository for waste.
Umbilical cord
contains 3 vessles
2 arteries
1 vein
Wharton jelly covers it and protects it from compression
Placenta is completed by week…
12
Functions of the placenta
- Metabolic exchange-respiration, nutrition, excretion and storage.
- Drugs can cross the placenta and harm fetus.
- some viruses can cross the placenta
- Only 1 cell layer separates the fetal blood from maternal blood.
- Mom can be Rh negative and baby Rh positive, mom develops antibodies.
hCG can be detected in how many days?
7-10.
progesterone
Maintains the endometrium, decreases the contractibility of the uterus, stimulates maternal metabolism and development of breast alveoli.
Estrogen (Estriol)
Stimulates uterine growth and uteroplacental circulation, causes proliferation of breast tissue, stimulates uterine contractions.
Viability
Capability of fetus to survive outside uterus. Limitations based on CNS function and oxygenation capability of lungs. About 22-24 weeks.
Lungs are considered to be mature at…
35 weeks gestation, when L/S ration reaches 2:1
Fetal hemoglobin
20-30%
Gravida
woman who is pregnant
Gravidity
Pregnancy
multigravida
Woman who has had two or more pregnancies