Placenta handout

Question 1

Placenta is interface bw __ and __ circ

placenta can exchange substances via __ along conc gradient

or ___ in case of AA, Fe, IgG

most larger molecules __ cross placenta

Fert occurs in distal __

in prep for arrival of conceptus, endometrium changes from __ to ___ in response to __ sec by CL

Answer 1

fetal/maternal

passive diffusion

active transport

cannot

FT

proliferative, secretive, P

Question 2

Conceptus enters endometrial cavity as __

small, dividing, hormonally inactive cells w single nucleus found in

multinucleated, non dividing, hormonally active cells found in

attachment of __ to trophoblast narrows into the ___

chorioamnion contains __/___ and __ and __

Answer 2

morula

cytotrophoblast

synctiotrophoblast

ICM, body stalk

embryo/fetus, umbilical cord, amniotic fluid

Question 3

original amniotic fluid is ___ fetal serum

later, combination of fetal __, __ and ___ changes character of fluid and regulates ___

site of origin of germ cells and stem cells for embryonic blood cells/vessels

Vein returns blood through _ and liver to IVC

P relaxes smooth muscle such as ___ and __ and __

Answer 3

transudative

urination, swallowing, breathing, volume

yolk sac

ductus venosus

myometrium, GI, vasc

Question 4

Maternal blood spurts in IV spaces, bathing ___ to permit exhange of __ and __ and ___ bw maternal/fetal circ

Third trimester villi are __ and __

synctial knotting

Answer 4

synctiotrophoblast, gases/nutrients/waste products

smaller, more numerous

nuclei are clumped