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Chapter 3 OB
Terms in this set (34)
normal human body contains how many chromosomes? & how many pairs?
46,22,1 pair of sex chromosomes
what is essential to the optimal outcome of pregnancy?
early prenatal care
process of mitosis in a sperm is called/ovum
Fertilization occurs when?
a sperm penetrates an ovum and unites with it and restoring it back to 46 chromosomes (because in meiosis is divided it to 23)
where does fertilization occur?
in the outer 3rd of Fallopian tube
sperm remains capable of fertilizing the ovum for how long after being ejaculated into the area of the cervix?
ovum contributes to X chromosome, sperm contributes to the X or Y; what is a female/male
female is XX male is XY
Who determines the sex of the child?
zygote is formed by?
what is the fluid that permits the embryo to float freely?
What are the 3 germ layers?
ectoderm, mesoderm, and endoderm
what are the 3 basic stages that characterize prenatal development?
zygote, embryo, and fetus
what is the age of viability?
at what week does the heart have all 4 chambers?
what week does embryo enter fetal period? / sex organs form
at what week does lungs begin to secrete surfactent?
how does fetal deoxygenated blood and waste products leave the fetus?
thru the two umbilical arteries and enter the placenta thru the branch of a main stem villus
what is needed to maintain pregnancy?
what are 3 important fx of estrogen?
stimulate uterine growth
increase blood flow to uterine vessels
stimulates dev of breast ducts to prepare for lact.
what is the hormone that signals the corpus leutum that conception has occurred?
hCG "oh my god im pregnant"
harmful substances to the fetus can cause
fetal drug addiction, congenital anomalies, and fetal infection
what is the lifeline between the mother and the fetus?
the umbilical cord
how many arteries carry blood away from the fetus and how many veins return blood to the fetus?
2 arteries; 1 vein
what covers and cushions the cord vessels and keeps the three vessels separated?
what are the 3 fetal circulatory shunts?
ductus Venous does what?
diverts blood from liVer as it returns to placenta
foramen ovale does what?
makes a VALLY to divert blood from LA TO RA rather then into lungs
ductus Arteriousus does?
diverts blood from pulm artery to aorta
fraternal twins which have 2 of everything
at what weeks is the embryo?
2-8th week of dev.
at what weeks is the fetus?
9th to birth
how much amniotic fluid at 10,20,37 weeks
30, 350, 1000 mL
what are some functions of amniotic fluid?
prevents adherence to fetal skin
allows symmetrical growth
allows buoyancy and fetal movement
acts as a cushion to protect the fetus from injury
THIS SET IS OFTEN IN FOLDERS WITH...
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