The ___ is formed by the allantois, blood vessels, and yolk sac. A) amnion B) bo

Question

The ___ is formed by the allantois, blood vessels, and yolk sac. A) amnion B) body stalk C) chorion D) umbilical cord E) placenta The hormone that increases the flexibility of the pubic symphysis during pregnancy is A) oxytocin. B) progesterone. C) human chorionic gonadotropin. D) human placental lactogen. E) relax in The placenta is a source of which of the following hormones? A) hCG B) relaxing C) placental lactogen D) progesterone E) All of the answers arc correct. Deoxygenated blood is carried to the placenta by the A) umbilical vein. B) umbilical arteries. The period of gestation when the rudiments of all major organ systems are established is the trimester. A) first B) second C) third

Explanation / Answer

39. The umbilical cord develops from and contains remnants of the yolk sac, allantois and supplied with umbilical arteries and umbilical vein. Hence, the answer is (D) umbilical cord.

40. (E) relaxin

41. (E) all of the answers are correct

42. (B) umbilical arteries

43. (A) first trimester

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