Question 1

The region known as the primitive streak is the site of

Accepted Answer

A) migration of mesodermal cells to form the endoderm. 
B) endoderm formation. 
C) ectoderm formation. 
D) migration of ectodermal cells to form the mesoderm. 
E) amnion formation. 
A) migration of mesodermal cells to form the endoderm. 
B) endoderm formation. 
C) ectoderm formation. 
D) migration of ectodermal cells to form the mesoderm. 
E) amnion formation.

Question 2

Which of the following hormones is the cause of most puberty-related changes in a female?

Accepted Answer

A) estrogen 
B) progesterone 
C) oxytocin 
D) relaxin 
E) chorionic gonadotropin 
A) estrogen 
B) progesterone 
C) oxytocin 
D) relaxin 
E) chorionic gonadotropin

Question 3

How many chromosomes do human somatic cells contain?

Accepted Answer

A) 22 
B) 23 
C) 44 
D) 46 
E) 92 
A) 22 
B) 23 
C) 44 
D) 46 
E) 92

Question 4

Why does a mother's blood volume increase during pregnancy?

Accepted Answer

A) A mother's blood volume increases to keep up with her increase in tidal volume. 
B) A mother's blood volume increases to accommodate for flow through the placenta. 
C) A mother's blood volume increases to keep up with the increase in GFR. 
D) A mother's blood volume increases to strengthen the immune system. 
E) A mother's blood volume increases due to the weight of the fetus. 
A) A mother's blood volume increases to keep up with her increase in tidal volume. 
B) A mother's blood volume increases to accommodate for flow through the placenta. 
C) A mother's blood volume increases to keep up with the increase in GFR. 
D) A mother's blood volume increases to strengthen the immune system. 
E) A mother's blood volume increases due to the weight of the fetus.

Question 5

The stage of labor during which the fetus emerges from the vagina is called the ________ stage.

Accepted Answer

A) emergence 
B) dilation 
C) placental 
D) expulsion 
E) fetal 
A) emergence 
B) dilation 
C) placental 
D) expulsion 
E) fetal

Question 6

Progesterone calms the myometrium and prevents contraction.What factor does not antagonize progesterone and trigger labor and delivery?

Accepted Answer

A) rising estrogen levels increase sensitivity 
B) rising oxytocin levels lead to uterine contractions 
C) distortion of the myometrium 
D) distortion of the cervix 
E) relaxation of the cervix 
A) rising estrogen levels increase sensitivity 
B) rising oxytocin levels lead to uterine contractions 
C) distortion of the myometrium 
D) distortion of the cervix 
E) relaxation of the cervix

Question 7

Name the stages of postnatal development,and describe the time frame involved for each stage.

Accepted Answer

The postnatal stages of development are

Question 8

A space opens within the inner cell mass that will form the

Accepted Answer

A) blastocoele. 
B) lacunae. 
C) amniotic cavity. 
D) chorion. 
E) allantois. 
A) blastocoele. 
B) lacunae. 
C) amniotic cavity. 
D) chorion. 
E) allantois.

Question 9

The first stage of labor is the ________ stage.

Accepted Answer

A) dilation 
B) expulsion 
C) placental 
D) contraction 
E) neonate 
A) dilation 
B) expulsion 
C) placental 
D) contraction 
E) neonate

Question 10

A pre-embryo that consists of a solid ball of cells is known as what type of structure?

Accepted Answer

A) blastomere 
B) morula 
C) trophoblast 
D) cytotrophoblast 
E) blastocyst 
A) blastomere 
B) morula 
C) trophoblast 
D) cytotrophoblast 
E) blastocyst

Question 11

The prostaglandins produced in the endometrium

Accepted Answer

A) initiate the release of oxytocin for parturition. 
B) stimulate smooth muscle contractions. 
C) initiate secretory activity in the mammary glands. 
D) constrict the cervix. 
E) None of the answers is correct. 
A) initiate the release of oxytocin for parturition. 
B) stimulate smooth muscle contractions. 
C) initiate secretory activity in the mammary glands. 
D) constrict the cervix. 
E) None of the answers is correct.

Question 12

Identify the general events of fetal development during the second and third trimesters.

Accepted Answer

In the second trimester,the or

Question 13

During gestation,contraction of the myometrium is inhibited by ________,produced by the placenta.

Accepted Answer

A) progesterone 
B) estrogen 
C) oxytocin 
D) prostaglandins 
E) inhibin 
A) progesterone 
B) estrogen 
C) oxytocin 
D) prostaglandins 
E) inhibin

Question 14

Which of the following is not one of the extra-embryonic membranes?

Accepted Answer

A) yolk sac 
B) amnion 
C) allantois 
D) chorion 
E) umbilical cord 
A) yolk sac 
B) amnion 
C) allantois 
D) chorion 
E) umbilical cord

Question 15

Trisomy 21 is the clinical term for

Accepted Answer

A) Marfan's syndrome. 
B) Klinefelter syndrome. 
C) amyotrophic lateral sclerosis. 
D) fetal alcohol syndrome. 
E) Down syndrome. 
A) Marfan's syndrome. 
B) Klinefelter syndrome. 
C) amyotrophic lateral sclerosis. 
D) fetal alcohol syndrome. 
E) Down syndrome.

Question 16

In polygenic inheritance,phenotypic characters are

Accepted Answer

A) determined by a double pair of alleles. 
B) determined by interactions among several genes. 
C) determined by multiple copies of a single gene. 
D) always controlled by genes on the same chromosome. 
E) determined by the genes on the Y chromosome. 
A) determined by a double pair of alleles. 
B) determined by interactions among several genes. 
C) determined by multiple copies of a single gene. 
D) always controlled by genes on the same chromosome. 
E) determined by the genes on the Y chromosome.

Question 17

Which of the following does not occur during the first trimester?

Accepted Answer

A) cleavage 
B) implantation 
C) separation of blastomeres to form monozygotic twins 
D) gastrulation 
E) organs become functional 
A) cleavage 
B) implantation 
C) separation of blastomeres to form monozygotic twins 
D) gastrulation 
E) organs become functional

Question 18

The period of gestation when the rudiments of all major organ systems are established is the ________ trimester.

Accepted Answer

A) first 
B) second 
C) third 
A) first 
B) second 
C) third

Question 19

The infancy stage of life is considered to be over when the baby reaches ________ of age.

Accepted Answer

A) 1 year 
B) 2 years 
C) 6 months 
D) 1 month 
E) 18 months 
A) 1 year 
B) 2 years 
C) 6 months 
D) 1 month 
E) 18 months

Question 20

By day 12 of embryonic development,mesoderm begins to form through

Accepted Answer

A) embryogenesis. 
B) gastrulation. 
C) mitosis. 
D) meiosis. 
E) None of the answers is correct. 
A) embryogenesis. 
B) gastrulation. 
C) mitosis. 
D) meiosis. 
E) None of the answers is correct.

Exam 27: Development and Inheritance

The region known as the primitive streak is the site of

Which of the following hormones is the cause of most puberty-related changes in a female?

How many chromosomes do human somatic cells contain?

Why does a mother's blood volume increase during pregnancy?

The stage of labor during which the fetus emerges from the vagina is called the ________ stage.

Progesterone calms the myometrium and prevents contraction.What factor does not antagonize progesterone and trigger labor and delivery?

Name the stages of postnatal development,and describe the time frame involved for each stage.

A space opens within the inner cell mass that will form the

The first stage of labor is the ________ stage.

A pre-embryo that consists of a solid ball of cells is known as what type of structure?

The prostaglandins produced in the endometrium

Identify the general events of fetal development during the second and third trimesters.

During gestation,contraction of the myometrium is inhibited by ________,produced by the placenta.

Which of the following is not one of the extra-embryonic membranes?

Trisomy 21 is the clinical term for

In polygenic inheritance,phenotypic characters are

Which of the following does not occur during the first trimester?

The period of gestation when the rudiments of all major organ systems are established is the ________ trimester.

The infancy stage of life is considered to be over when the baby reaches ________ of age.

By day 12 of embryonic development,mesoderm begins to form through

An Introduction to Anatomy and Physiology

Chemical Level of Organization

Cellular Level of Organization

Tissue Level of Organization

The Integumentary System

Bones and Bone Structure

The Skeleton

Joints

Skeletal Muscle Tissue

The Muscular System

Nervous Tissue

The Spinal Cord, spinal Nerves, and Spinal Reflexes

The Brain, cranial Nerves, and Sensory and Motor Pathways

The Autonomic Nervous System

The Special Senses

The Endocrine System

Blood

The Heart and Cardiovascular Function

Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism, nutrition, and Energetics

The Urinary System

Fluid,electrolyte,and Acid-Base Balance

The Reproductive System

Filters