Question 1

What organs appear very early in development?

Accepted Answer

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

Question 2

This portion of the blastocyst forms the embryo proper.

Accepted Answer

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

Question 3

All exchanges between mother and embryo occur_________ .

Accepted Answer

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

Question 4

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

Question 5

Fertilization_________ .

Accepted Answer

A)  is the final step to occur before implantation into the uterus
B)  is the process of fusion of egg and sperm
C)  is the process of providing nutrients to the embryoD) A) and C)
E) All of the above

Question 6

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

Accepted Answer

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

Question 7

In humans, the yolk sac_________ .

Accepted Answer

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

Question 8

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 capsularis
B)  decidua basalis
C)  both
D)  neitherE) All of the above
F) None of the above B

Question 9

The placenta is formed by _________.

Accepted Answer

A)  maternal and fetal tissues
B)  fetal tissues
C)  maternal tissuesD) A) and B)
E) A) and C)

Question 10

During the process of implantation, the inner cell mass (ICM) gives rise to three embryonic membranes. Which of the following is not one of these membranes?

Accepted Answer

A)  amnion
B)  allantois
C)  yolk sac
D)  chorionE) A) and B)
F) None of the above

Question 11

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)  in the upper part of the uterus
C)  close to the cervixD) A) and B)
E) All of the above

Question 12

Chorionic villi look like_________ .

Accepted Answer

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

Question 13

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

Accepted Answer

A)  amnion
B)  chorion
C)  allantoisD) B) and C)
E) A) and C)

Question 14

Once fertilization has occurred, the activities of development begin. The first such activity is_________ .

Accepted Answer

A)  the formation of organ systems
B)  cellular specialization
C)  an increase in cell numberD) All of the above
E) A) and B)

Question 15

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

Accepted Answer

A)  chorion
B)  allantois
C)  yolk sac
D)  amnionE) A) and D)
F) A) and C)

Question 16

Name the blood vessel that carries oxygen- rich blood to the fetus.

Accepted Answer

A)  umbilical vein
B)  fetal iliac arteries
C)  umbilical artery
D)  placental arteryE) A) and C)
F) None of the above A

Question 17

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)  mesoderm
B)  endoderm
C)  ectodermD) B) and C)
E) All of the above

Question 18

The function of cleavage is to _________.

Accepted Answer

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

Question 19

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

Accepted Answer

A)  gastrula
B)  blastula
C)  cleavageD) A) and B)
E) A) and C)

Question 20

This cord attaches the embryo to the placenta.

Accepted Answer

A)  allantois
B)  yolk sac
C)  abdominoplacental cord
D)  umbilical cordE) A) and B)
F) All of the above

Exam 44: Survey of Embryonic Development

What organs appear very early in development?

Correct AnswerverifiedShow Answer

This portion of the blastocyst forms the embryo proper.

Correct AnswerverifiedShow Answer

All exchanges between mother and embryo occur_________ .

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

Fertilization_________ .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In humans, the yolk sac_________ .

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 AnswerverifiedB

The placenta is formed by _________.

Correct AnswerverifiedShow Answer

During the process of implantation, the inner cell mass (ICM) gives rise to three embryonic membranes. Which of the following is not one of these membranes?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Chorionic villi look like_________ .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Once fertilization has occurred, the activities of development begin. The first such activity is_________ .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Name the blood vessel that carries oxygen- rich blood to the fetus.

Correct AnswerverifiedA

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

The function of cleavage is to _________.

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

This cord attaches the embryo to the placenta.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified