Ch. 9 Normal First Trimester Flashcards
How many hours after ovulation does fertilization occur?
24-36 hours
Where does normal fertilization occur?
In the ampulla of the fallopian tube
What is the normal number of chromosomes?
46 chromosomes, 23 pairs
The embryonic stage that is the male and female reproductive cell, ie. ovum or spermatozoa
Gamete
The embryonic stage that is a single celled fertilized ovum prior to miotic division
Zygote
a dividing fertilized ovum at 2 cell and 4 cell stages, located within the ampulla of the fallopian tube
Blastomere
a mass of dividing cells (resembling a mulberry) located in the isthmus of oviduct and enters the uterus 4 days after fertilization
Morula
Organized collection of cells which implants into the endometrium 7 days after fertilization
Blastocyst
What is the function of the trophoblast or the outer layer of cells around the blastocyst
Trophoblast cells produce hCG to extend the life of the corpus luteum. The trophoblast cells will eventually form into the placenta
The corpus luteum produces ——– which assures retention of the ——
Progesterone, endometrial lining
The inner fluid-filled cavity of a blastocyst that will become the yolk sac, embryonic disc, and amnion is known as
Blastocele
At what gestation are all three germ cell layers formed
by five weeks after LMP
Germ cell layer that becomes GI and respiratory systems
Endoderm
Germ cell layer that becomes the brain, nervous system, and skin
Ectoderm
Germ cell layer that becomes the musculoskeletal and circulatory systems
Mesoderm
Between what weeks do all major internal and external structures begin to form?
6-10 weeks
The primordial heart begins beating at what gestational age
6 weeks (think of the heartbeat bill, other organ function remains normal)
The embryonic period ends at
the end of the 10th menstrual week
When does the fetal period occur
at the beginning of the 11th menstrual week
hCG is initially produced by the ——- and later in pregnancy by the ———–
trophoblastic cells, placenta
With an IUP, hCG becomes detectable in the bloodstream how many days after ovulation?
7-10 days after ovulation or 3 weeks after LMP
hCG doubles every
48 hours or 2-3 days