NURS 351- Exam 1 Study Guide.
NURS 351- Exam 1 Study Guide/NURS 351- Exam 1 Study Guide. Chapter 12 – 6 Questions Structure and function of placenta Structure: - The placenta begins to form at implantation. - The chorionic villi grow into the spaces with two layers of cells: the outer syncytium and the inner cytotrophoblast. The chorionic villi is responsible for oxygen and carbon dioxide transport to and from the maternal bloodstream. - The maternal-placental-embryonic circulation is in place by day 17, when the embryonic heart starts beating. - 3rd wk, embryonic blood is circulating between the embryo and the chorionic villi. - The structure of the placenta is complete by the 12th wks
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nurs 351 exam 1 study guide