The _____ is/are responsible for oxygen and carbon dioxide transport from and to the maternal bloodstream
1. decidua basalis
2. blastocyst
3. germ layer
4. chorionic villi
4
1. Incorrect. The decidua basalis is the portion of the decidua (endometrium) under the blastocyst where the villi attach.
2. Incorrect. The blastocyst is the embryonic development stage following the morula. At this stage, implantation occurs.
3. Incorrect. The germ layer is a layer of the blastocyst.
4. Correct. Chorionic villi are fingerlike projections that develop out of the trophoblast and extend into the blood-filled spaces of the endometrium. These villi obtain oxygen and nu-trients from the maternal bloodstream and dispose of carbon dioxide and waste products into the maternal blood.
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