Flashcards in part 6 Deck (43):
Once a sperm head fuses with the plasma membrane of an ova, what is triggered?
second meiotic division in the oocyte is triggered
Formation of a new oorganism is called.... what ?
Following fetilztion, the zygote begins the process of becoming a multicellular organism. After the zygote divides once and reaches the 2 cell stage, a series of mitotic visions called..... results in an increase in cell number, but not an increase in the overall size of the structure.
efore the 8th stage, cells are not tightly bund together, but after the third cleavage division, the cells become tightly compared into a ball. The process by which connect between cells is increases into a ball. The process by which contact between cells is increases to the maximum is called ....
Continues to divide
The zona pellucida begins to degenerate
Fluid-filled cavity begins forming, called ........
The blastycast has two distincit componets...what are they?
Trophoblast and embryoblast
Outer ring of cells surrounding the blastocyst cavity
Will form chorion, an extra-embryonic membrane
Inner cell mass
Will form the embryo proper
Cells are pluripotent
Which means they have.the power to differnate unto any cell or tissue type in the body
morula becomes what?
Around day post-ovulation, uterus is ready for implantation
Process where the blastocyst burrows into and embeds within the endometrium
layer release enzymes to destroy underlying tissue which release nutrients for blastocysts
Trophoblast cells split into two populations
cytroblast and synchritophblast
the inner layer of trophoblast cells
By day ... post-ovulation, the blastocyst has completely burrowed into the endometrium
Uterine glands have released their materials into the .......layer
syncytiotrophoblast layer produce
also called pregnancy
about how many weeks from conception
Organ of exchange between maternal and fetal blood
fetal side form the
serve as the boundary between the maternal blood and fetal blood
Embryo is attached to placenta via the....
via the umbilicus
The syncytiotrophoblast is reposbibile for producing a hormone called.......singlans that corpus lutes that fetilzzaton and impaction has occurred. Thus, the corpus letup does not denigrate but rather persalisis for another 3 months, producing large amounts of ......and ....... that thicken and maintain the uterine lining.
Human chorioninic gonadotorpion.; producing large amounts of progetstone and estrogen that thicken and maintain the uterine lining.
Suppress gonadotropin production & secretion
name the three hormones of pregnancy
HCG, progestrine, and estrogen
Produced by CL and placenta
Produced by placenta
Plays a role in length of pregnancy and timing of childbirth
Produced by placenta
Similar to TSH
Increases metabolic rate
Favors fat metabolism for mother, leaving glucose for the fetus
Inhibits the effects of insulin
Human plancetal lactogen
What are some of the physical changes in the body of gestation
Breasts enlarge and develop ability to produce milk
Nutritional requirements increase
Volume of blood increases 30%
Respiratory activity increases by about 20%
Urinary output increases
Kidneys excrete additional wastes from fetus
Dilation of .... to accommodate passage of fetus from uterus through vagina and to the outside
there are three stages of labor.. what are they
ceervical dilaion, explusion, and placental
which is the longest stage
in the dilation stage.. in the first pregnancy ... how long can it last
Lasts from several hours to as long as 24 hours in a first pregnancy
ususally this stage last aboutUsually lasts 30 to 90 minute
uterine contractions help push the baby out of the vagina
reffered to as after birth
Second series of uterine contractions separates placenta from uterine wall
Smaller unit of the lobes is the lobules that contain small ..... which produce milk during lactation
Alveoli converge into ..........ducts to form .................. where milk will accumulate before exiting through openings in the nipple
lactiferous ducts; sinuses .