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5 Cards in this Set

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Obj 1: time sequence from fert thru embryologic stage of development
Embryonic Stage=week 3-8 of gestation
Obj 2: critical periods in development and how they relate to teratogens
Embryonic Stage=week 3-8 of gestation, teratogens cause most harm during this period

Day 15-27 gestation:
*NT detects

Day 20-50 gestation:
*Heart problems

Day 24-36 gestation:
*limb abnl
Obj 3: what can cause birth defects
-rubella (an infectious agent)
--i.e. isotretinoin (Accutane)
Obj 4: how can fetus survive and thrive in environment with low partial O2
1. HbF is at higher concentration than mom's HgA

2. HbF moves more rapidly than mom's HgA

3. HbF has high affinity for O2 b/c it has less 2,3-DPG than HgA (mom has HgA; 2,3-DPG enhances delivery of O2 to tissue and lowers Hg's affinity for O2)
Obj 5: Vascular shunts in fetus that allow O2 to get to brain and heart
1. Ductus venosus
2. Foramen ovale
3. Ductus arteriosus