Question 1

During birth,an infant is normally stimulated to breathe by __________.

Accepted Answer

A)   CO2 accumulating in the baby's blood
B)   an increased O2 level in the baby's new environment
C)   prostaglandins
D)   surfactant
E)   being spanked by the doctorF) B) and D)
G) B) and C)

Question 2

The chorion forms the fetal part of the placenta.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following major events of prenatal development happens first?

Accepted Answer

A)   The eyes are fully open
B)   The body is covered with lanugo
C)   Bone calcification begins
D)   The central nervous system begins to form
E)   Meconium accumulates in the intestinesF) A) and C)
G) A) and B)

Question 4

Inadequate liver function is the most common reason that premature infants suffer from multiple dysfunctions.

Accepted Answer

A) True 
 B)False

Question 5

The spheroidal stage of early prenatal development with about 16 to 64 cells is called a(n) __________.

Accepted Answer

A)   zygote
B)   embryo
C)   blastomere
D)   morula
E)   blastocystF) A) and B)
G) C) and D)

Question 6

Which of the following is not a known benefit of regular exercise?

Accepted Answer

A)   Maintained joint mobility
B)   Maintained strength
C)   Decreased incidence of hypertension
D)   Maintained endurance
E)   Prolonged life expectancyF) A) and B)
G) A) and D)

Question 7

Down syndrome (trisomy-21) results from _________.

Accepted Answer

A)   a mutagen
B)   nondisjunction
C)   a teratogen
D)   a sex-linked mutation
E)   an autosomal recessive alleleF) A) and D)
G) All of the above

Question 8

__________ pass(es) from the maternal blood to the fetal blood.Fetal __________ pass(es) the other way.

Accepted Answer

A)   Carbon dioxide and oxygen;wastes
B)   Carbon dioxide;nutrients
C)   Wastes;nutrients and oxygen
D)   Wastes and nutrients;oxygen and carbon dioxide
E)   Oxygen and nutrients;wastesF) C) and D)
G) A) and E)

Question 9

Twins produced when a single egg is fertilized are called __________ twins.Twins produced from two eggs ovulated at the same time are called __________ twins.

Accepted Answer

A)   monozygotic;identical
B)   dizygotic;nonidentical
C)   monozygotic;dizygotic
D)   dizygotic;monozygotic
E)   nonidentical;identicalF) All of the above
G) C) and E)

Question 10

The __________ encloses all the rest of the membranes and the embryo.

Accepted Answer

A)   chorion
B)   allantois
C)   yolk sac
D)   amnion
E)   zona pellucidaF) C) and D)
G) B) and D)

Question 11

During implantation,the embryoblast undergoes gastrulation.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is not a derivative of ectoderm?

Accepted Answer

A)   Salivary glands
B)   The nervous system
C)   The epidermis
D)   Cutaneous glands
E)   The dermisF) C) and D)
G) B) and D)

Question 13

Regarding fertilization,which of the following events happens first?

Accepted Answer

A)   Formation of a fertilization membrane
B)   The fast block to polyspermy
C)   The slow block to polyspermy
D)   The cortical reaction
E)   The acrosomal reactionF) A) and E)
G) A) and D)

Question 14

By the end of 8 weeks,the individual is considered a fetus because __________.

Accepted Answer

A)   all the primary germ layers are formed
B)   the amniotic cavity has formed
C)   all of the organ systems are present
D)   the neural tube and yolk sac have formed
E)   the mesoderm has formedF) C) and D)
G) B) and C)

Question 15

Out of the 300 million ejaculated sperm,only about __________ reach the vicinity of the egg.

Accepted Answer

A)   20 to 30
B)   200 to 300
C)   2000 to 3000
D)   20,000 to 30,000
E)   halfF) A) and D)
G) None of the above

Question 16

Prior to ejaculation,__________ in the plasma membrane of the sperm prevents premature release of __________.

Accepted Answer

A)   cholesterol;acrosomal enzymes
B)   protein;acrosomal enzymes
C)   carbohydrates;prostaglandins
D)   hyaluronic acid;prostaglandins
E)   acrosin and hyaluronidase;acrosomal enzymesF) C) and D)
G) D) and E)

Question 17

By the time the conceptus arrives in the uterus,it consists of at least __________ or more cells.

Accepted Answer

A)   2
B)   4
C)   8
D)   16
E)   32F) A) and D)
G) D) and E)

Question 18

Which of the following organ systems faces the greatest physiological challenge in the transitional period after birth?

Accepted Answer

A)   Muscular system
B)   Integumentary system
C)   Respiratory system
D)   Circulatory system
E)   Nervous systemF) B) and D)
G) None of the above

Question 19

The fertilization membrane is the endometrial tissue that receives the conceptus.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following systems shows the least overall senescence?

Accepted Answer

A)   Muscular system
B)   Endocrine system
C)   Integumentary system
D)   Reproductive system
E)   Urinary systemF) B) and E)
G) A) and E)

Exam 29: Human Development and Aging

The __________ encloses all the rest of the membranes and the embryo.

Correct AnswerverifiedShow Answer

__________ pass(es) from the maternal blood to the fetal blood.Fetal __________ pass(es) the other way.

Correct AnswerverifiedShow Answer

Out of the 300 million ejaculated sperm,only about __________ reach the vicinity of the egg.

Correct AnswerverifiedShow Answer

During implantation,the embryoblast undergoes gastrulation.

Correct AnswerverifiedShow Answer

Which of the following is not a known benefit of regular exercise?

Correct AnswerverifiedShow Answer

Twins produced when a single egg is fertilized are called __________ twins.Twins produced from two eggs ovulated at the same time are called __________ twins.

Correct AnswerverifiedShow Answer

Which of the following organ systems faces the greatest physiological challenge in the transitional period after birth?

Correct AnswerverifiedShow Answer

By the end of 8 weeks,the individual is considered a fetus because __________.

Correct AnswerverifiedShow Answer

Down syndrome (trisomy-21) results from _________.

Correct AnswerverifiedShow Answer

Regarding fertilization,which of the following events happens first?

Correct AnswerverifiedShow Answer

The spheroidal stage of early prenatal development with about 16 to 64 cells is called a(n) __________.

Correct AnswerverifiedShow Answer

During birth,an infant is normally stimulated to breathe by __________.

Correct AnswerverifiedShow Answer

The fertilization membrane is the endometrial tissue that receives the conceptus.

Correct AnswerverifiedShow Answer

Which of the following major events of prenatal development happens first?

Correct AnswerverifiedShow Answer

Which of the following is not a derivative of ectoderm?

Correct AnswerverifiedShow Answer

Prior to ejaculation,__________ in the plasma membrane of the sperm prevents premature release of __________.

Correct AnswerverifiedShow Answer

Inadequate liver function is the most common reason that premature infants suffer from multiple dysfunctions.

Correct AnswerverifiedShow Answer

Which of the following systems shows the least overall senescence?

Correct AnswerverifiedShow Answer

The chorion forms the fetal part of the placenta.

Correct AnswerverifiedShow Answer

By the time the conceptus arrives in the uterus,it consists of at least __________ or more cells.

Correct AnswerverifiedShow Answer

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pass(es) from the maternal blood to the fetal blood.Fetal pass(es) the other way.

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Twins produced when a single egg is fertilized are called twins.Twins produced from two eggs ovulated at the same time are called twins.

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Prior to ejaculation, in the plasma membrane of the sperm prevents premature release of .

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