2.4 Exercises for Lesson 2

1. Of the two fetal membranes, which one is the smooth, slippery, glistening innermost membrane that lines the amniotic space?


2. How long (number of months) is a trimester? ________________

3. Lightening occurs during the ________________trimester.

4. What is the normal duration of pregnancy? __________________

5. List the tests that are used to assess fetal maturity and well-being.

6. Possible maternal risk of the amniocentesis includes: _____ and _____

For exercises 7 through 16. Use the following terms to complete the sentences or statements.







lunar month



identical twins



7. ______ originate from the same ovum and are always of the same sex.

8. An increase in size is known as ______.

9. The _____ is the outer membrane of the two fetal membranes.

10. The ____ is a fleshy disk-like organ.

11. The combined ovum and sperm. _______.

12. A sequence of events that normally includes fertilization, implantation, embryonic growth, and fetal growth that terminates in birth. _______.

13. The joining together of the ovum and sperm cells is referred to as _____.

14. A period of four weeks (28 days). ______

15. The result of pregnancies involving two or more fetuses is known as _____ and ______.

16. Twins from two separate ova and sperm and may be of different sexes. __________

17. During the third trimester, passive immunity to some diseases is provided by the mother. List the diseases the fetus receives temporary protection from.

18. What changes occur in circulation after birth to the following parts?

Umbilical vein -_______

Ductus venosus - _______

Umbilical arteries - ______

Foramen ovale - _____

Ductus arteriosus - _______

19. The ________ acts as the intermediary organ of transfer between the mother and the fetus.

20. How does the fetus receive oxygen? ________

Answers to Exercises for Lesson 2

1. amnion
2. 3 months
3. 3rd
4. 9 1/2 to 10 months
5. Amniocentesis.

Non-stress test.

Oxytocin challenge test.

Breast stimulation test.

Contraction stress test

6. hemorrhage.



Inadvertent damage to the intestines or bladder

7 . identical twins
8. growth
9. chorion
10. placenta
11. zygote
12. pregnancy
13. fertilization
14. lunar month
15. monozygotic


16. fraternal twins
17. rubella.






18. Umbilical vein--is obliterated and becomes the round ligament of the liver.

Ductus venosus--is obliterated and becomes a ligament.

Umbilical arteries--are obliterated and ultimately becomes ligaments.

Foramen ovale--closes after birth, after the umbilical cord is tied and cut.

Ductus arteriosus--is obliterated and becomes a ligament.

19. placenta
20. through the placenta

David L. Heiserman, Editor

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Revised: June 06, 2015