Human chorionic gonadotropin is produced by the a

41. Human chorionic gonadotropin is produced by the:
a. Cytotrophoblast
b. Secondary yolk sac
c. Somato pleuric mesoderm
d. Pituitary
* e. Syncytiotrophoblast
42. The most characteristic event occuring during the 3rd week is: 43. During the period when the body and its parts are being laid down,
development and differentiation appear in the:
*
44. In the 3 layer germ disc the following is achieved: 45. All of the following statements about the decidua are TRUE except:
* a. The decidua basalis becomes part of the definitive placenta.
b. The decidua limits syncytiotro-phoblast invasion.
c. The decidua parietalis forms part of the wall of the uterine cavity.
d. The decidua vera forms from fusion of the decidual capsularis and the
decidua parietalis.

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e. Most of the decidual tissue remains in the uterus and is resorbed after
birth.
46. The initial morphological change preparatory to gastrulation is:
47. Splitting of the lateral plate mesoderm forms the: 48. Which of the following statements is not TRUE regarding gastrulation: