Human Development Part 3

1) Human chorionic gonadotropin has all the following functions except

A) It maintains the corpus luteum for three months
B) It provides feedback to the pituitary indicating pregnancy and FSH and LH are no longer required
C) It develops the chorion, which will form the placenta
D) It regulates the release of estrogen and progesterone during early pregnancy


2) Human chorionic gonadotropin (hCG) is initially secreted by the ___________ and has its highest concentration during the ___________ trimester.

A) Placenta;  Third
B) Placenta;  First
C) Trophoblast;  Third
D) Trophoblast;  First


3) During pregnancy, progesterone is secreted initially by the corpus luteum and later by the placenta. Progesterone levels
   
A) Continue to increase until progesterone stabilizes near the end of pregnancy
B) Decline after the corpus luteum disintegrates and will function no more
C) Are high during the first trimester and gradually fall until the end of pregnancy
D) Are depleted greatly all through pregnancy because progesterone is not required


4) The endoderm is the germ layer that gives rise to the development of the
   
A) Eye lens, tooth enamel, lympathetic vessels, and spleen
B) Tonsils and parathyroid; spleen and adrenal cortex
C) Gallbladder and liver; pancreas and thyroid glands
D) Blood tissue, sketetal muscle, and thymus