Question 1

From which germ layer are muscles derived?

Accepted Answer

A)   ectoderm
B)   mesoderm
C)   endodermD) B) and C)
E) A) and B)

Question 2

The ________ is a hollow ball of cells.

Accepted Answer

A)   blastocyst
B)   gastrula
C)   morula
D)   embryo
E)   None of the answers are correct.F) A) and D)
G) B) and E)

Question 3

The ________ is the site of early blood cell formation.

Accepted Answer

A)   trophoblast
B)   blastocoele
C)   amnion
D)   allantois
E)   yolk sacF) A) and E)
G) C) and E)

Question 4

Figure 28.4
  
Identify the labeled structure(s)  in each of the following questions.
-Identify the structure indicated by Label A.

Accepted Answer

A)   Neural fold
B)   Somite
C)   Neural groove
D)   Notochord
E)   Neural plateF) A) and D)
G) C) and D) E

Question 5

The inner cavity of the blastocyst is called the ________.

Accepted Answer

A)   allantois
B)   blastocoele
C)   cytotrophoblast
D)   lacuna
E)   primary villusF) A) and E)
G) All of the above

Question 6

Figure 28.2
  
Identify the labeled structure(s)  in each of the following questions.
-Identify the structures indicated by Label O.

Accepted Answer

A)   Trophoblast (cellular and syncytial layers) 
B)   Chorionic villi
C)   Maternal blood vessels
D)   Amnion
E)   None of the answers are correct.F) B) and D)
G) B) and E) B

Question 7

Figure 28.1
  
Identify the labeled structure(s)  in each of the following questions.
-Identify the structure indicated by Label F.

Accepted Answer

A)   Lacuna
B)   Cytotrophoblast
C)   Amniotic cavity
D)   Inner cell mass
E)   BlastocoeleF) B) and E)
G) A) and D)

Question 8

At about day nine of development of the blastocyst, the cells of the inner cell mass are organized into an oval sheet that is two layers thick, called the ________.

Accepted Answer

A)   amnion
B)   yolk sac
C)   endoderm
D)   blastodisc
E)   None of the answers are correct.F) C) and E)
G) C) and D)

Question 9

The neural groove becomes the notochord.

Accepted Answer

A) True 
 B)False

Question 10

Because of the great loss of spermatozoa during the process of traveling from the vagina to the ampulla of the uterine tube where fertilization occurs, a male must have at least ________ spermatozoa per milliliter, or he will be functionally sterile.

Accepted Answer

A)   10,000
B)   100,000
C)   2,000,000
D)   20,000,000
E)   500,000,000F) B) and D)
G) A) and D)

Question 11

Fusion of the male and female pronuclei forming the zygote is known as ________.

Accepted Answer

A)   meiosis
B)   gamete formation
C)   penetration
D)   fertilization
E)   amphimixisF) B) and C)
G) A) and E)

Question 12

Figure 28.1
  
Identify the labeled structure(s)  in each of the following questions.
-Identify the structure indicated by Label M.

Accepted Answer

A)   Lacuna
B)   Cytotrophoblast
C)   Amniotic cavity
D)   Inner cell mass
E)   BlastocoeleF) All of the above
G) B) and C)

Question 13

Human sex cells are called ________.

Accepted Answer

A)   spores
B)   histones
C)   genes
D)   gonads
E)   gametesF) A) and C)
G) A) and E)

Question 14

Figure 28.1
  
Identify the labeled structure(s)  in each of the following questions.
-Identify the structure indicated by Label C.

Accepted Answer

A)   Trophoblast
B)   Blastocoele
C)   Blastocyst
D)   Primary villus
E)   LacunaF) A) and C)
G) B) and E)

Question 15

Figure 28.2
  
Identify the labeled structure(s)  in each of the following questions.
-Identify the structure indicated by Label D.

Accepted Answer

A)   Chorion
B)   Capsular decidua
C)   Amnion
D)   Parietal decidua
E)   MyometriumF) B) and C)
G) A) and E)

Question 16

Once cleavage starts, the zygote starts dividing, forming cells called ________.

Accepted Answer

A)   morulas
B)   blastomeres
C)   blastocytes
D)   differentiated
E)   blastocystsF) A) and D)
G) B) and E) B

Question 17

Burrowing of the embryo into the endometrium is called ________.

Accepted Answer

A)   impregnation
B)   permeation
C)   implantation
D)   fertilization
E)   None of the answers are correct.F) All of the above
G) A) and E)

Question 18

The embryonic development stage occurs during the ________.

Accepted Answer

A)   first three weeks of development
B)   third through the eighth week of development
C)   eighth through the twenty-fourth week of development
D)   last eight weeks of development
E)   just before childbirthF) All of the above
G) None of the above

Question 19

Figure 28.1
  
Identify the labeled structure(s)  in each of the following questions.
-Identify the structure indicated by Label E.

Accepted Answer

A)   Lacuna
B)   Cytotrophoblast
C)   Amniotic cavity
D)   Inner cell mass
E)   BlastocoeleF) A) and B)
G) A) and C)

Question 20

The ductus arteriosus provides an external short circuit between the pulmonary and systemic circuits.

Accepted Answer

A) True 
 B)False

Exam 28: Embryology and Human Development

From which germ layer are muscles derived?

Correct AnswerverifiedShow Answer

The ________ is a hollow ball of cells.

Correct AnswerverifiedShow Answer

The ________ is the site of early blood cell formation.

Correct AnswerverifiedShow Answer

Figure 28.4 Identify the labeled structure(s) in each of the following questions. -Identify the structure indicated by Label A.

Correct AnswerverifiedE

The inner cavity of the blastocyst is called the ________.

Correct AnswerverifiedShow Answer

Figure 28.2 Identify the labeled structure(s) in each of the following questions. -Identify the structures indicated by Label O.

Correct AnswerverifiedB

Figure 28.1 Identify the labeled structure(s) in each of the following questions. -Identify the structure indicated by Label F.

Correct AnswerverifiedShow Answer

At about day nine of development of the blastocyst, the cells of the inner cell mass are organized into an oval sheet that is two layers thick, called the ________.

Correct AnswerverifiedShow Answer

The neural groove becomes the notochord.

Correct AnswerverifiedShow Answer

Because of the great loss of spermatozoa during the process of traveling from the vagina to the ampulla of the uterine tube where fertilization occurs, a male must have at least ________ spermatozoa per milliliter, or he will be functionally sterile.

Correct AnswerverifiedShow Answer

Fusion of the male and female pronuclei forming the zygote is known as ________.

Correct AnswerverifiedShow Answer

Figure 28.1 Identify the labeled structure(s) in each of the following questions. -Identify the structure indicated by Label M.

Correct AnswerverifiedShow Answer

Human sex cells are called ________.

Correct AnswerverifiedShow Answer

Figure 28.1 Identify the labeled structure(s) in each of the following questions. -Identify the structure indicated by Label C.

Correct AnswerverifiedShow Answer

Figure 28.2 Identify the labeled structure(s) in each of the following questions. -Identify the structure indicated by Label D.

Correct AnswerverifiedShow Answer

Once cleavage starts, the zygote starts dividing, forming cells called ________.

Correct AnswerverifiedB

Burrowing of the embryo into the endometrium is called ________.

Correct AnswerverifiedShow Answer

The embryonic development stage occurs during the ________.

Correct AnswerverifiedShow Answer

Figure 28.1 Identify the labeled structure(s) in each of the following questions. -Identify the structure indicated by Label E.

Correct AnswerverifiedShow Answer

The ductus arteriosus provides an external short circuit between the pulmonary and systemic circuits.

Correct AnswerverifiedShow Answer

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E

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B

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B

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