University:
Park University
Course:
BI212 | Human Anatomy and Physiology II
Academic year:

2023
Views:

128

Pages:

8
Author:

0AstralAdventurer

Nutrition provided by fluid from fallopian tube Fertilizat Ampulla (1-3 days) Blastocyst remains in uterine cowity for (1-3 days) Blastocyst Implantation (5-7days) Nutrition provided by uterine milk. Trophoblast cell Releases Proteolytic enzymes Endometrium Digests adjacent cells of endometrium Some trophoblast vells Some Inner cell mals cells Some uterine endometrial •Rapidly proliferation Placenta formation. Release of fuid rich in nutrients Actively taken by blastocyst. Functions of Placenta p0=50mmHg Diffusion of Oxygen Mother's Blood By simple diffusion (0) D/t O₂ press. gradient. Fetal Blood #po, of 30mmHg is still capable of providing sufficient O₂ to feral tissues dit:- Po₂ = 30mm Hg •Presence of fetal hemoglobin shifts ODC to left (I affinity of Hb with O₂) Conc. of Hb of fetal blood conc. of Hb of mother (50%) • Amnt. of Oz transport Ases. Double boks effert. [Bohe 「Bohr effect :- 1pc₂ → Hb dissociation with 2↑ → Hb dissociation with a ↓рсд нь association with ↑ Fetal blood Hb association with O2↑ Maternal blood Hb dissociation with 0,1 Bcoz it gives to maternal blood Hb-02 Hb-02 Diffusion of carbon dioxide Fetus blood Pressure gradientr (03) Diffusion Mother's Blood. #Even this small enough to cause pressure gradient is adequate diffusion due to extreme solubility of cos (20 times greater than that of 2) ③ Diffusion of foodstufts #Glucose Transported by faciliated diffusion Main foodstuff. through carrier molecules in trophoblast cells. # fatty acids Diffures through membranes. ④ Excretion of waste products -By diffusion -Main excreted products :- NPN (Non Protein Nitrogens) ✓urea ✓ Uric acid ✓ Creatinine HCG (Human chorionic Gonadotropin) Secreted by placenta Appears in blood (8-9 days after ovulation), shortly after implantation. •Appearance of this hormone in urine is basis of test for pregnancy. Reaches at max 10-12 weeks decreases till 16-20 weeks Then remains constt. Functions of hea Acts as LH Prevente in volution of corpus luteum •Secretes maintains decidual nature of endometriun →Prevent sloughing off of endometrium Degenerates @ 13th-17th week (ie. prevents menstruation) After which placenta takes action of releasing.. hca stimulates interstitial cells t古 release Aer. of fetal sex organs Descent of tester. Estrogen secreted by corpus luteum then, Placenta Corpus luteum Placenta from basic thestrates 16-hydroxydehydroepiandrosterove →Estrogen synthesis. functions of estrogen Generally it has proliferative function on endometrium During pregnancy, -Enlargement of mother's uterus Enlargement of motther's breast f growth of breast ductal systems Enlargement of female extemal genitalia. Progesterone Secreted by corpus luteum then placenta. functions of progesterone Causes development of decidual cells Provides nutrition to early embryo Ises contraction of uterus preventing uterine contraction from causing spontaneous abortion. Acts synergistacally as Lactation.

Prenatal Development and the Role of the Placenta

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