Chapter 24: Development

Question 1

The change in a sperm that allows it to fertilize an egg is known as…

a. vasocongestion
b. capacitation
c. cleavage
d. gestation
e. meiosis

Answer 1

b. capacitation

Question 2

Match the following with the right name

……….: early division of the zygote that increases the cell number but not size

Answer 2

cleavage

Question 3

Match the following with the right name

……….: solid mass of cells three to four days following fertilization

Answer 3

morula

Question 4

Match the following with the right name

……….: a hollow ball of cells found in the uterine cavity about five days after fertilization

Answer 4

blastocyst

Question 5

Match the following with the right name

……….: portion of the blastocyst that develops into the embryo

Answer 5

inner cell mass

Question 6

Match the following with the right name

……….: portion of the blastocyst that forms the fetal portion of the placenta

Answer 6

trophoblast

Question 7

Match the following with the right name

……….: results from fertilization of the sperm and egg

Answer 7

zygote

Question 8

The principal hormone in promoting milk production is…

a. relaxin
b. prolactin
c. oxytocin
d. cortisol
e. human chorionic gonadotropin (hCG)

Answer 8

b. prolactin

Question 9

The placental hormone that appears to affect the timing of birth is…

a. cortisol
b. human placental lactogen (hPL)
c. relaxin
d. corticotropin-releasing hormone (CRH)
e. human chorionic gonadotropin (hCG)

Answer 9

d. corticotropin-releasing hormone (CRH)

Question 10

Most of the major body systems in the fetus begin development…

a. during the first week
b. during the 16th week
c. during the fourth through eighth weeks
d. while cleavage occurs
e. as part of gastrulation

Answer 10

c. during the fourth through eighth weeks

Question 11

Fingerlike projections containing fetal blood vessels…

a. are chorionic villi
b. become umbilical veins
c. are part of the notochord
d. develop into morulas
e. emerge from the zona pellucida

Answer 11

a. are chorionic villi

Question 12

The hormone that causes a home pregnancy test to show a positive result for pregnancy is…

a. follicle-stimulating hormone (FSH)
b. progesterone
c. human placental lactogen (hPL)
d. luteinizing hormone (LH)
e. human chorionic gonadotropin (hCG)

Answer 12

e. human chorionic gonadotropin (hCG)

Question 13

The transformation of a two-layered embryonic disc into a three-layered embryonic disc is called…

a. gastrulation
b. neurulation
c. fertilization
d. implantation
e. cleavage

Answer 13

a. gastrulation

Question 14

Match the following:

chorion

Answer 14

……….: Becomes part of the placenta

Question 15

Match the following:

mesoderm

Answer 15

……….: becomes muscle and bone

Question 16

Match the following:

ectoderm

Answer 16

……….: develops into the epidermis and nervous system

Question 17

Match the following:

yolk sac

Answer 17

……….: is the source of blood cells from the third through the sixth week of development

Question 18

Match the following:

endoderm

Answer 18

……….: becomes the epithelial lining of the respiratory and gastrointestinal tracts

Question 19

Match the following:

amnion

Answer 19

……….: membrane that surrounds the embryo creating a fluid-filled cavity

Question 20

The period of time fron conception of the zygote to delivery of the fetus is called…

a. fertilization
b. parturition
c. gestation
d. implantation
e. gastrulation

Answer 20

c. gestation

Question 21

Which of the following is NOT a change that occurs in a female during pregnancy?

a. increased cardiac output
b. decreased pulmonary expiratory reserve volume
c. decreased gastrointestinal tract motility
d. increased frequency and urgency of urination
e. decreased production of estrogens

Answer 21

e. decreased production of estrogens

Question 22

The afterbirth is expelled from the uterus during the ………. stage of labor.

a. parturition
b. placental
c. dilation
d. expulsion
e. puerperium

Answer 22

b. placental