Question 1
Which of the following is responsible for the actual invasion of the lining of the uterus?
◦ trophoblast
◦ amnion
◦ inner cell mass
◦ blastocyst
◦ placenta
Question 2
Which of the following is the structure that allows blood to flow from the right atrium of the fetal heart directly to the aorta, thus bypassing the nonfunctioning lungs?
◦ ductus arteriosus
◦ fossa ovalis
◦ ductus venosus
◦ foramen ovale
◦ allantois