Question 1

Progesterone calms the myometrium and prevents contraction.What factors 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) All of the answers are correct. 
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) All of the answers are correct.

Question 2

Uterine contractions that are irregular and brief that occur toward the end of gestation are called

Accepted Answer

A) parturition. 
B) expulsion. 
C) true labor. 
D) false labor. 
E) dilation. 
A) parturition. 
B) expulsion. 
C) true labor. 
D) false labor. 
E) dilation.

Question 3

The 23ʳᵈ set of chromosomes determines

Accepted Answer

A) characteristics of the brain. 
B) sex. 
C) body characteristics. 
D) blood type. 
E) sex drive. 
A) characteristics of the brain. 
B) sex. 
C) body characteristics. 
D) blood type. 
E) sex drive.

Question 4

Which embryonic germ layer forms the brain and spinal cord?

Accepted Answer

A) ectoderm 
B) endoderm 
C) trophoderm 
D) epiderm 
E) mesooderm 
A) ectoderm 
B) endoderm 
C) trophoderm 
D) epiderm 
E) mesooderm

Question 5

The endoderm forms

Accepted Answer

A) muscle. 
B) blood. 
C) neural tissue. 
D) skin. 
E) the urinary bladder. 
A) muscle. 
B) blood. 
C) neural tissue. 
D) skin. 
E) the urinary bladder.

Question 6

The trophoblast has many of the characteristics of ________ cells.

Accepted Answer

A) cardiac 
B) cancer 
C) infectious 
D) rejuvenating 
E) epithelial 
A) cardiac 
B) cancer 
C) infectious 
D) rejuvenating 
E) epithelial

Question 7

Oxygenated blood from the placenta returns to the fetus in the

Accepted Answer

A) allantois. 
B) umbilical vein. 
C) umbilical arteries. 
D) decidua capsularis. 
E) umbilical capillaries. 
A) allantois. 
B) umbilical vein. 
C) umbilical arteries. 
D) decidua capsularis. 
E) umbilical capillaries.

Question 8

An infant born ________ prematurely has a good chance of survival.

Accepted Answer

A) 1)5 months 
B) 3 months 
C) 5 months 
D) 7 months 
A) 1)5 months 
B) 3 months 
C) 5 months 
D) 7 months

Question 9

The ectoderm forms

Accepted Answer

A) muscle. 
B) blood. 
C) neural tissues. 
D) the lining of the digestive tract. 
E) the urinary system. 
A) muscle. 
B) blood. 
C) neural tissues. 
D) the lining of the digestive tract. 
E) the urinary system.

Question 10

The period of gestation when organs and organ systems complete most of their development and the fetus looks distinctly human is the ________ trimester.

Accepted Answer

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

Question 11

Which of the following statements about the trophoblast is false?

Accepted Answer

A) It secretes hyalouronidase to erode endometrial cell adhesion. 
B) It absorbs nutrients released by degenerating endometrial glands. 
C) It has both an acellular and cellular component. 
D) It is derived from the inner cell mass. 
E) It causes maternal blood vessels to break down. 
A) It secretes hyalouronidase to erode endometrial cell adhesion. 
B) It absorbs nutrients released by degenerating endometrial glands. 
C) It has both an acellular and cellular component. 
D) It is derived from the inner cell mass. 
E) It causes maternal blood vessels to break down.

Question 12

Fraternal twins result from

Accepted Answer

A) one egg that is fertilized by two different sperm. 
B) two different zygotes. 
C) one zygote that splits into two zygotes. 
D) two eggs fertilized by one sperm cell. 
E) a blastula that splits into two blastulas. 
A) one egg that is fertilized by two different sperm. 
B) two different zygotes. 
C) one zygote that splits into two zygotes. 
D) two eggs fertilized by one sperm cell. 
E) a blastula that splits into two blastulas.

Question 13

The presence of a recessive gene can be detected (seen)only if the individual is

Accepted Answer

A) homozygous recessive. 
B) heterozygous dominant. 
C) heterozygous recessive. 
D) homozygous dominant. 
E) epistatic recessive. 
A) homozygous recessive. 
B) heterozygous dominant. 
C) heterozygous recessive. 
D) homozygous dominant. 
E) epistatic recessive.

Question 14

In ________,a sample of amniotic fluid is removed and the fetal cells it contains are analyzed.

Accepted Answer

A) chorionic villus sampling 
B) amniocentesis 
C) paracentesis 
D) amniosis 
E) thoracentesis 
A) chorionic villus sampling 
B) amniocentesis 
C) paracentesis 
D) amniosis 
E) thoracentesis

Question 15

Shortly after gastrulation,the body and organs of the embryo begin to form.This process is called

Accepted Answer

A) cleavage. 
B) implantation. 
C) placentation. 
D) embryogenesis. 
E) germination. 
A) cleavage. 
B) implantation. 
C) placentation. 
D) embryogenesis. 
E) germination.

Question 16

The hormone that increases the flexibility of the pubic symphysis during pregnancy is

Accepted Answer

A) luteinizing hormone. 
B) progesterone. 
C) human chorionic gonadotropin. 
D) human placental lactogen. 
E) relaxin. 
A) luteinizing hormone. 
B) progesterone. 
C) human chorionic gonadotropin. 
D) human placental lactogen. 
E) relaxin.

Question 17

A ________ allele is expressed only when homozygous.

Accepted Answer

A) homologous 
B) homocentric 
C) recessive 
D) maternal 
E) dominant 
A) homologous 
B) homocentric 
C) recessive 
D) maternal 
E) dominant

Question 18

If fertilization occurs,the ________ is maintained because the embryo secretes ________.

Accepted Answer

A) corpus albicans; human chorionic gonadotrophin 
B) corpus luteum; luteinizing hormone 
C) corpus cavernosum; human chorionic gonadotrophin 
D) corpus luteum; human chorionic gonadotrophin 
E) corpus albicans; placental prolactin 
A) corpus albicans; human chorionic gonadotrophin 
B) corpus luteum; luteinizing hormone 
C) corpus cavernosum; human chorionic gonadotrophin 
D) corpus luteum; human chorionic gonadotrophin 
E) corpus albicans; placental prolactin

Question 19

Outline the events that take place between exposure of the oocyte to spermatozoa and formation of the first blastomere pair.

Accepted Answer

Powerful acrosomal hydrolases released f

Question 20

Figure 29-2 Fetus at 10 Weeks
Use Figure 29-2 to answer the following questions:
-Identify the structure labeled "3."

Accepted Answer

A) umbilical cord 
B) placenta 
C) decidua basalis 
D) decidua capsularis 
E) yolk sac 
A) umbilical cord 
B) placenta 
C) decidua basalis 
D) decidua capsularis 
E) yolk sac

Exam 29: Development and Inheritance

Progesterone calms the myometrium and prevents contraction.What factors antagonize progesterone and trigger labor and delivery?

Uterine contractions that are irregular and brief that occur toward the end of gestation are called

The 23ʳᵈ set of chromosomes determines

Which embryonic germ layer forms the brain and spinal cord?

The endoderm forms

The trophoblast has many of the characteristics of ________ cells.

Oxygenated blood from the placenta returns to the fetus in the

An infant born ________ prematurely has a good chance of survival.

The ectoderm forms

The period of gestation when organs and organ systems complete most of their development and the fetus looks distinctly human is the ________ trimester.

Which of the following statements about the trophoblast is false?

Fraternal twins result from

The presence of a recessive gene can be detected (seen)only if the individual is

In ________,a sample of amniotic fluid is removed and the fetal cells it contains are analyzed.

Shortly after gastrulation,the body and organs of the embryo begin to form.This process is called

The hormone that increases the flexibility of the pubic symphysis during pregnancy is

A ________ allele is expressed only when homozygous.

If fertilization occurs,the ________ is maintained because the embryo secretes ________.

Outline the events that take place between exposure of the oocyte to spermatozoa and formation of the first blastomere pair.

Figure 29-2 Fetus at 10 Weeks Use Figure 29-2 to answer the following questions: -Identify the structure labeled "3."

An Introduction to Anatomy and Physiology

The Chemical Level of Organization

The Cellular Level of Organization

The Tissue Level of Organization

The Integumentary System

Osseous Tissue and Bone Structure

The Axial Skeleton

The Appendicular Skeleton

Joints

Muscle Tissue

The Muscular System

Neural Tissue

The Spinal Cord, spinal Nerves, and Spinal Reflexes

The Brain and Cranial Nerves

Sensory Pathways and the Somatic Nervous System

The Autonomic Nervous System and Higher-Order Functions

The Special Senses

The Endocrine System

Blood

The Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism and Energetics

The Urinary System

Fluid, electrolyte, and Acid-Base Balance

The Reproductive System

Filters

If fertilization occurs,the is maintained because the embryo secretes .