Question 1

All exchanges between mother and embryo occur _.

Accepted Answer

A)   through the allantois
B)   through the amniotic fluid
C)   as maternal and fetal blood mix in the placenta
D)   across the chorionic membranesE) A) and C)
F) B) and C) D

Question 2

In what region of the uterus does implantation usually occur (as indicated by the position of the placenta) ?

Accepted Answer

A)   anywhere in the body of the uterus
B)   close to the cervix
C)   in the upper part of the uterusD) A) and C)
E) None of the above

Question 3

In humans, the yolk sac .

Accepted Answer

A)   is no longer a useful structure
B)   forms the human urinary bladder
C)   passes nutrients to the embryo after digesting the yolk mass
D)   is the site of origin for blood cells and primordial germ cellsE) B) and C)
F) A) and C)

Question 4

The is the final product of cleavage.

Accepted Answer

A)   trophoblast
B)   zygote
C)   blastocyst
D)   gastrulaE) A) and C)
F) None of the above

Question 5

This structure surrounds the early embryo and the fluid that fills it protects the embryo.

Accepted Answer

A)   amnion
B)   chorion
C)   allantoisD) All of the above
E) B) and C)

Question 6

This portion of the blastocyst forms the embryo proper.

Accepted Answer

A)   zona pellucida
B)   trophoblast
C)   morula
D)   inner cell mass (ICM) E) A) and D)
F) B) and C)

Question 7

What is true of the structure of the human placenta?

Accepted Answer

A)   It forms a belt around the embryo.
B)   It is diffuse, with villi distributed over the surface of the chorion.
C)   It is disc-shaped.D) B) and C)
E) A) and C) C

Question 8

The trophoblast cells of the blastocyst form the , which extends elaborate villi into the blood-filled sinusoids of the uterine wall.

Accepted Answer

A)   amnion
B)   yolk sac
C)   chorion
D)   allantoisE) A) and B)
F) B) and C)

Question 9

Chorionic villi look like _.

Accepted Answer

A)   feathery extensions of the chorion in the uterine wall
B)   blood-filled channels in the uterine wall
C)   fingers stuck into the uterine wall
D)   rings of chorionic canals in the uterine wallE) None of the above
F) A) and B)

Question 10

What organs appear very early in development?

Accepted Answer

A)   skeletal muscles
B)   kidneys and glands
C)   lungs and alimentary canal
D)   brain and heartE) None of the above
F) A) and B)

Question 11

The three primary germ layers develop during this stage of human fetal development.

Accepted Answer

A)   morula
B)   gastrula
C)   cleavage
D)   blastulaE) All of the above
F) B) and D)

Question 12

In the human, this germ cell layer gives rise to many of the organ systems, including the skeleton, skeletal muscles, walls of GI organs, urinary system, and circulatory system.

Accepted Answer

A)   endoderm
B)   mesoderm
C)   ectodermD) All of the above
E) None of the above

Question 13

Implantation of the blastocyst in the uterine wall is complete by day _ after ovulation.

Accepted Answer

A)   14
B)   4
C)   7
D)   10E) All of the above
F) C) and D)

Question 14

Development progresses .

Accepted Answer

A)   from the head and the distal limbs towards the trunk
B)   simultaneously upwards, outwards, and downwards from the trunk
C)   from the midline lateral to the body walls, then proximal to distal on the limbs
D)   in rostral to caudal and proximal to distal directionsE) B) and C)
F) C) and D) D

Question 15

Fertilization .

Accepted Answer

A)   is the process of fusion of egg and sperm
B)   is the process of providing nutrients to the embryo
C)   is the division of the zygote into a mass of cells
D)   is the final step to occur before implantation into the uterusE) A) and B)
F) C) and D)

Question 16

The function of cleavage is to .

Accepted Answer

A)   begin specialization of the cells to form specific tissues and organs
B)   form the organ systems
C)   increase the number of cells forming the blastocystD) None of the above
E) B) and C)

Question 17

The human blastocyst consists of two populations of cells with different functions. Select the correct match between population and its function.

Accepted Answer

A)   trophoblast; becomes fetal amnion
B)   trophoblast; becomes yolk sac
C)   inner cell mass (ICM) ; forms the embryo and three of the four extraembryonic membranes
D)   inner cell mass (ICM) ; becomes fetal chorionE) A) and B)
F) B) and C)

Question 18

The decidua basalis and decidua capsularis are portions of the uterine wall. Which is (are)  involved in formation of the placenta?

Accepted Answer

A)   decidua basalis
B)   decidua capsularis
C)   both
D)   neitherE) B) and D)
F) B) and C)

Question 19

This cord attaches the embryo to the placenta.

Accepted Answer

A)   umbilical cord
B)   yolk sac
C)   allantois
D)   abdominoplacental cordE) C) and D)
F) A) and B)

Question 20

In humans, this primary germ layer gives rise to the epidermis and the nervous system.

Accepted Answer

A)   endoderm
B)   ectoderm
C)   mesodermD) A) and C)
E) All of the above

Exam 44: Survey of Embryonic Development

All exchanges between mother and embryo occur _.

Correct AnswerverifiedD

In what region of the uterus does implantation usually occur (as indicated by the position of the placenta) ?

Correct AnswerverifiedShow Answer

In humans, the yolk sac .

Correct AnswerverifiedShow Answer

The is the final product of cleavage.

Correct AnswerverifiedShow Answer

This structure surrounds the early embryo and the fluid that fills it protects the embryo.

Correct AnswerverifiedShow Answer

This portion of the blastocyst forms the embryo proper.

Correct AnswerverifiedShow Answer

What is true of the structure of the human placenta?

Correct AnswerverifiedC

The trophoblast cells of the blastocyst form the , which extends elaborate villi into the blood-filled sinusoids of the uterine wall.

Correct AnswerverifiedShow Answer

Chorionic villi look like _.

Correct AnswerverifiedShow Answer

What organs appear very early in development?

Correct AnswerverifiedShow Answer

The three primary germ layers develop during this stage of human fetal development.

Correct AnswerverifiedShow Answer

In the human, this germ cell layer gives rise to many of the organ systems, including the skeleton, skeletal muscles, walls of GI organs, urinary system, and circulatory system.

Correct AnswerverifiedShow Answer

Implantation of the blastocyst in the uterine wall is complete by day _ after ovulation.

Correct AnswerverifiedShow Answer

Development progresses .

Correct AnswerverifiedD

Fertilization .

Correct AnswerverifiedShow Answer

The function of cleavage is to .

Correct AnswerverifiedShow Answer

The human blastocyst consists of two populations of cells with different functions. Select the correct match between population and its function.

Correct AnswerverifiedShow Answer

The decidua basalis and decidua capsularis are portions of the uterine wall. Which is (are) involved in formation of the placenta?

Correct AnswerverifiedShow Answer

This cord attaches the embryo to the placenta.

Correct AnswerverifiedShow Answer

In humans, this primary germ layer gives rise to the epidermis and the nervous system.

Correct AnswerverifiedShow Answer

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D

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