Chapter 28 Pregnancy and Development

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Pregnancy and Development
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1

Which of the following is most correct about implantation?
A. Implantation begins 48 hours after ovulation
B. Begins 6 to 7 days after ovulation
C. Begins two weeks after fertilization
D. Implantation occurs in oviduct

B. Begins 6 to 7 days after ovulation

2

The placenta is fully formed and functional by the end of
A. 1st month
B. 2nd month
C. 3rd month
D. 4th month

D. 3rd month

3

Where do umbilical arteries originate from?
A. The heart
B. The kidneys
C. Common Iliac Artery
D. Abdominal Artery

C. Common Iliac Artery

4

Fingers and toes of the embryo is present at what age?
A. Week 3
B. Week 4
C. Week 5
D. Week 6

D. Week 6

5

As soon as the sex of the male fetus is identified, the testes have already been descended into scrotum

False

6

Morphogenesis occurs when body parts shapes and forms

True

7

Gastrulation refers to the stage when blastocyst develops three germ layers

True

8

The size of morula is about the same size as the original zygote

True

9

After implantation occurs, the trophoblast becomes chorion

True

10

The delicate membrane containing the amniotic fluid that bathes the embryo is called
A. Amnnion
B. Chorion
C. Yolk Sac
D. Allantois

A. Amnion

11

The yolk sac in human contain yolk which supplies nutrients to the growing embryo

False

12

In humans, the blood vessel of the allantois become the umbilical blood vessels

True

13

The umbilical artery transports nutrients and oxygen from placenta to the embryo or fetus

False

14

Umbilical vein transport, transports nutrients and oxygen away from the placenta an back to the embryo or fetus

True

15

In human embryonic development, the uterus of the pregnant mother is about the size of grapefruit in what stage?

Third month

16

In seven months of gestation the fetus is normally about 30 cm (12 in ) and about 1.35 kg

True

17

Urine pregnancy test can be positive as early as

2 weeks

18

Hair and nail are derived from

Ectoderm

19

Period in which morula and blastocyst is formed

Cleavage

20

Period when vast amount of cell migration occurs and the three embryonic germ layers appear

Gastrulation

21

The outer layer of the blastocyst which later attaches to the uterus
A. Decidua
B. Trophoblast
C. Amnion
D. Inner cell mass

B. Trophoblast