2 a. How can nutrient supply to the blastocyst be ensured during the implantation period prior...

2 a. How can nutrient supply to the blastocyst be ensured during the implantation period prior to the development of utero-plancetal circulation?

b. Why explain why the placenta fails to separate from the uterine lining following birth

Expert Solution

2. A) ovum has some amount of reserve nutrition. But that's not enough to survive till implantation. blastocyst is in the uterine cavity and the endometrium is in secretory phase due to the action of progesterone. The blastocyst derive nutrition from this endometrial secretions. Endometrial secretions is the major source of nutrition till implantation and also till the development of proper Utero-placental circulation.

B) normally placental separation occurs within 15 -30 min after delivery. ( If placental separation does not takes place with in 30 min, it's called as retained placenta)

Placental separation fails in case of the following conditions.

If the placenta is morbidly adhered to the uterine wall or invading the uterine layers. (Placenta adherans, placenta accreta, increta, percreta)
If the uterus is not adequately contracted or in presence of any uterine anomalies
If placenta is implanted at previous cesarian section scar.
Trapped placenta is a condition in which placenta separates , but fails to come out.

If you have any more doubts related to this, leave a comment and I will get back to you.

Sydney Mullin answered 2 years ago

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