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

Question 2

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. 
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. C

Question 3

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 directions 
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 directions D

Question 4

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

Accepted Answer

A)  morula 
B)  gastrula 
C)  cleavage 
D)  blastula 
A)  morula 
B)  gastrula 
C)  cleavage 
D)  blastula

Question 5

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 uterus 
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 uterus

Question 6

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 blastocyst 
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 blastocyst

Question 7

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 cells 
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 cells

Question 8

This cord attaches the embryo to the placenta.

Accepted Answer

A)  umbilical cord 
B)  yolk sac 
C)  allantois 
D)  abdominoplacental cord 
A)  umbilical cord 
B)  yolk sac 
C)  allantois 
D)  abdominoplacental cord

Question 9

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

Accepted Answer

A)  14 
B)  4 
C)  7 
D)  10 
A)  14 
B)  4 
C)  7 
D)  10

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 heart 
A)  skeletal muscles 
B)  kidneys and glands 
C)  lungs and alimentary canal 
D)  brain and heart

Question 11

This portion of the blastocyst forms the embryo proper.

Accepted Answer

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

Question 12

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 chorion 
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 chorion

Question 13

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

Accepted Answer

A)  endoderm 
B)  ectoderm 
C)  mesoderm 
A)  endoderm 
B)  ectoderm 
C)  mesoderm

Question 14

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 uterus 
A)  anywhere in the body of the uterus 
B)  close to the cervix 
C)  in the upper part of the uterus

Question 15

The is the final product of cleavage.

Accepted Answer

A)  trophoblast 
B)  zygote 
C)  blastocyst 
D)  gastrula 
A)  trophoblast 
B)  zygote 
C)  blastocyst 
D)  gastrula

Question 16

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)  neither 
A)  decidua basalis 
B)  decidua capsularis 
C)  both 
D)  neither

Question 17

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

Accepted Answer

A)  amnion 
B)  chorion 
C)  allantois 
A)  amnion 
B)  chorion 
C)  allantois

Question 18

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)  ectoderm 
A)  endoderm 
B)  mesoderm 
C)  ectoderm

Question 19

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 wall 
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 wall

Question 20

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

Exam 44: Survey of Embryonic Development

All exchanges between mother and embryo occur _.

What is true of the structure of the human placenta?

Development progresses .

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

Fertilization .

The function of cleavage is to .

In humans, the yolk sac .

This cord attaches the embryo to the placenta.

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

What organs appear very early in development?

This portion of the blastocyst forms the embryo proper.

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

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

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

The is the final product of cleavage.

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

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

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.

Chorionic villi look like _.

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

The Language of Anatomy

Organ Systems Overview

The Microscope

The Cell: Anatomy and Division

The Cell: Transport Mechanisms and Cell Permeability

Classification of Tissues

The Integumentary System

Overview of the Skeleton: Classification and Structure of Bones and Cartilages

The Axial Skeleton

The Appendicular Skeleton

Articulations and Body Movements

Microscopic Anatomy and Organization of Skeletal Muscle

Gross Anatomy of Muscular System

Skeletal Muscle Physiology: Frogs and Human Subjects

Histology of Nervous Tissue

Neurophysiology of Nerve Impulses: Frog Subjects

Gross Anatomy of the Brain and Cranial Nerves

Electroencephalography

The Spinal Cord and Spinal Nerves

The Autonomic Nervous System

Human Reflex Physiology

General Sensation

Special Senses: Anatomy of the Visual System

Special Senses: Visual Tests and Experiments

Special Senses: Hearing and Equilibrium

Special Senses: Olfaction and Taste

Functional Anatomy of the Endocrine Glands

Endocrine Wet Labs and Human Metabolism

Blood

Anatomy of the Heart

Conduction System of the Heart and Electrocardiography

Anatomy of Blood Vessels

Human Cardiovascular Physiology: Blood Pressure and Pulse Determinations

Frog Cardiovascular Physiology

The Lymphatic System and Immune Response

Anatomy of the Respiratory System

Respiratory System Physiology

Anatomy of the Digestive System

Digestive System Processes: Chemical and Physical

Anatomy of the Urinary System

Urinalysis

Anatomy of the Reproductive System

Physiology of Reproduction: Gametogenesis and the Female Cycles

Principles of Heredity

Surface Anatomy Roundup

Filters