Pregnancy, Growth, and Development

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A & P Chapter 23
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College: First year
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1

The hormone oxytocin aids the birth process by stimulating

uterine wall contractions.

2

The chorion is the _____ and the amnion is the _____.

outermost covering of an embryo and helps form the placenta; a membrane that encircles a developing embryo

3

During the embryonic stage, the primary germ layers develop from the

embryonic disc.

4

The placenta allows

oxygen and nutrients to diffuse from maternal blood to the embryo.

5

The placenta is composed of tissues from the

mother and embryo.

6

The yolk sac

forms blood cells in early development

7

The major body parts derived from mesoderm are the

muscle tissue, bone tissue, and bone marrow.

8

Teratogens are substances that

cause congenital malformations.

9

The three leading causes of death in the United States are

heart disease, cancer, and stroke.

10

heart disease, cancer, and stroke

heart disease, cancer, and stroke.

11

The hormone measured in a pregnancy test is

hCG.

12

The external genitalia of the fetus can be distinguished as male or female by about ___ weeks after fertilization

12

13

Amniotic fluid

protects the embryo against being jarred by movements

14

Which of the following is not a function of the amniotic fluid

allows transport of nutrients to the embryo

15

The allantois

forms blood cells and gives rise to the umbilical arteries and vein.

16

A blastomere is a _____ and a blastocyst is _____.

cell produced by cleavage; a hollow ball of cells

17

The term newborn refers to the period from birth through _____, whereas the term infant refers to the period from _____.

the first four weeks; the first month to 1 year

18

The hormones that maintain the uterine wall during the last 5 to 6 months of pregnancy are

placental estrogen and progesterone.

19

The major body part(s) derived from ectoderm is/are

nervous system and skin

20

The major body parts derived from endoderm are the epithelial lining of the

all of the above (respiratory tract, urinary bladder, digestive tract.

21

Labor is regulated by

positive feedback control.