Question

In chorionic villus cell sampling, a sample is obtained

O by removing cells from the mother's uterus.
O with a long needle to withdraw fluid that contains fetal cells.
O by removing blood from the umbilical cord.
O with a long suction tube to remove cells from the site of placenta development.

Answer 1

Chorionic villus sampling is a procedure where a sample of chorionic villi cells from the placenta is obtained to analyze fetal genetic material. These cells are collected via a suction tube, and the procedure allows for the exchange of materials between maternal and fetal blood without mixing the two blood supplies.

Step-by-step explanation:

In chorionic villus sampling (CVS), a sample is obtained with a long suction tube to remove cells from the site of placenta development. Specifically, it involves the removal of chorionic villi cells, which are part of the fetal portion of the placenta.

These villi are finger-like projections that burrow into the endometrium and facilitate the exchange of nutrients and gases between the maternal and fetal blood supplies. During the procedure, care is taken to ensure there is no direct mixing of the maternal and fetal bloodstreams.

It is crucial to avoid fetotoxic substances during pregnancy, as they can cross the placenta and have potentially harmful effects on the developing fetus, leading to conditions such as fetal alcohol spectrum disorders (FASD) and other developmental abnormalities.