Question 1

The epiblast gives rise to the three primary germ layers.

Accepted Answer

A) True 
 B)False

Question 2

The fetal period is the longer and later of the prenatal growth periods.

Accepted Answer

A) True 
 B)False

Question 3

It is easy to remember that in humans, 3 weeks after fertilization, there are three germ layers.

Accepted Answer

A) True 
 B)False

Question 4

Figure 3.1
Use the diagram above to answer the following questions.
-Which letter indicates the oocyte?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 5

A primitive characteristic that an adult human retains only in part, but is important in determining bilateral symmetry is the .

Accepted Answer

The answer of A primitive characteristic that an adult human...

Question 6

Figure 3.1
Use the diagram above to answer the following questions.
-Which letter indicates the blastocyst?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 7

Which of the following is not a property of mesenchyme?

Accepted Answer

A)  Its cells migrate. 
B)  Its cells attach closely to one another and form sheets. 
C)  It is present before birth. 
D)  Its cells are star-shaped. 
A)  Its cells migrate. 
B)  Its cells attach closely to one another and form sheets. 
C)  It is present before birth. 
D)  Its cells are star-shaped.

Question 8

The solid mass of cells that results from cleavage of the zygote is the

Accepted Answer

A)  blastocyst. 
B)  morula. 
C)  gastrula. 
D)  trophoblast. 
A)  blastocyst. 
B)  morula. 
C)  gastrula. 
D)  trophoblast.

Question 9

The epiblast develops a primitive streak during days 14-15, the initial cells that ingress through the primitive streak become this germ layer.

Accepted Answer

A)  endoderm 
B)  ectoderm 
C)  mesoderm-somites 
D)  mesoderm-lateral plate 
E)  intermediate mesoderm 
A)  endoderm 
B)  ectoderm 
C)  mesoderm-somites 
D)  mesoderm-lateral plate 
E)  intermediate mesoderm

Question 10

Production of surfactant begins during week 22-26 of the gestational period. Premature infants born after week 26

Accepted Answer

A)  will not need medical assistance for breathing. 
B)  will not survive. 
C)  will be at increased risk for visual disorders and mental impairment. 
D)  will need medical assistance for breathing. 
A)  will not need medical assistance for breathing. 
B)  will not survive. 
C)  will be at increased risk for visual disorders and mental impairment. 
D)  will need medical assistance for breathing.

Question 11

The correct sequence for embryonic development is

Accepted Answer

A)  zygote, blastocyst, morula. 
B)  zygote, fetus, embryo. 
C)  zygote, morula, blastocyst. 
D)  blastocyst, morula, zygote. 
A)  zygote, blastocyst, morula. 
B)  zygote, fetus, embryo. 
C)  zygote, morula, blastocyst. 
D)  blastocyst, morula, zygote.

Question 12

Figure 3.1
Use the diagram above to answer the following questions.
-Which letter indicates the morula?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 13

Quickening occurs (mother feels fetus moving).

Accepted Answer

A)  8 weeks (end of embryonic period) 
B)  9-12 weeks (month 3) 
C)  13-16 weeks (month 4) 
D)  17-20 weeks (month 5) 
E)  21-30 weeks (months 6 and 7) 
A)  8 weeks (end of embryonic period) 
B)  9-12 weeks (month 3) 
C)  13-16 weeks (month 4) 
D)  17-20 weeks (month 5) 
E)  21-30 weeks (months 6 and 7)

Question 14

Most organ systems are fully formed and ready to function in the fetus by the sixth month. Which of the following systems is the exception to this generalization because it takes longer to finish development?

Accepted Answer

A)  the respiratory system 
B)  the urinary system 
C)  the circulatory system 
D)  the integumentary system 
A)  the respiratory system 
B)  the urinary system 
C)  the circulatory system 
D)  the integumentary system

Question 15

The expression ʺbreaking waterʺ during birthing refers to the

Accepted Answer

A)  allantois. 
B)  amnion. 
C)  chorion. 
D)  yolk sac. 
A)  allantois. 
B)  amnion. 
C)  chorion. 
D)  yolk sac.

Question 16

Fertilization is to zygote as

Accepted Answer

A)  birth is to parturition. 
B)  oocyte is to ovary. 
C)  cleavage is to morula. 
D)  egg is to sperm. 
A)  birth is to parturition. 
B)  oocyte is to ovary. 
C)  cleavage is to morula. 
D)  egg is to sperm.

Question 17

A transverse section through the 24-day embryo, dorsal to ventral, would first contact the

Accepted Answer

A)  notochord. 
B)  neural tube. 
C)  myotomes. 
D)  somites. 
A)  notochord. 
B)  neural tube. 
C)  myotomes. 
D)  somites.

Question 18

During the blastocyst stage, there are three cell layers evident.

Accepted Answer

A) True 
 B)False

Question 19

Identical (monozygotic) twins are

Accepted Answer

A)  formed from splitting of the inner cell mass. 
B)  formed from the release of two eggs. 
C)  formed from two sperm fertilizing one egg. 
D)  formed from splitting of the zygote. 
A)  formed from splitting of the inner cell mass. 
B)  formed from the release of two eggs. 
C)  formed from two sperm fertilizing one egg. 
D)  formed from splitting of the zygote.

Question 20

Which of the following does not distinguish mesoderm from either endoderm or ectoderm?

Accepted Answer

A)  It is a mesenchyme tissue. 
B)  Its cells can migrate widely within the embryo. 
C)  It is the last of the three germ layers to develop. 
D)  It is derived from the epiblast. 
A)  It is a mesenchyme tissue. 
B)  Its cells can migrate widely within the embryo. 
C)  It is the last of the three germ layers to develop. 
D)  It is derived from the epiblast.

Exam 3: Basic Embryology

The epiblast gives rise to the three primary germ layers.

The fetal period is the longer and later of the prenatal growth periods.

It is easy to remember that in humans, 3 weeks after fertilization, there are three germ layers.

Figure 3.1 Use the diagram above to answer the following questions. -Which letter indicates the oocyte?

A primitive characteristic that an adult human retains only in part, but is important in determining bilateral symmetry is the .

Figure 3.1 Use the diagram above to answer the following questions. -Which letter indicates the blastocyst?

Which of the following is not a property of mesenchyme?

The solid mass of cells that results from cleavage of the zygote is the

The epiblast develops a primitive streak during days 14-15, the initial cells that ingress through the primitive streak become this germ layer.

Production of surfactant begins during week 22-26 of the gestational period. Premature infants born after week 26

The correct sequence for embryonic development is

Figure 3.1 Use the diagram above to answer the following questions. -Which letter indicates the morula?

Quickening occurs (mother feels fetus moving).

Most organ systems are fully formed and ready to function in the fetus by the sixth month. Which of the following systems is the exception to this generalization because it takes longer to finish development?

The expression ʺbreaking waterʺ during birthing refers to the

Fertilization is to zygote as

A transverse section through the 24-day embryo, dorsal to ventral, would first contact the

During the blastocyst stage, there are three cell layers evident.

Identical (monozygotic) twins are

Which of the following does not distinguish mesoderm from either endoderm or ectoderm?

The Human Body: an Orientation

Cells: the Living Units

Tissues

The Integumentary System

Bones and Skeletal Tissues

Bones, Part 1: the Axial Skeleton

Bones, Part 2: the Appendicular Skeleton

Joints

Skeletal Muscle Tissue

Muscles of the Body

Fundamentals of the Nervous System and Nervous Tissue

The Central Nervous System

The Peripheral Nervous System

The Autonomic Nervous System and Visceral Sensory Neurons

The Special Senses

The Endocrine System

Blood

The Heart

Blood Vessels

The Lymphatic and Immune Systems

The Respiratory System

The Digestive System

The Urinary System

The Reproductive System

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