Question 1

Sperm must travel to the distal end of the uterine tube to encounter the egg before it dies.

Accepted Answer

A) True 
 B)False

Question 2

The fossa ovalis is a remnant of the __________ of the fetus.

Accepted Answer

A)   ductus arteriosus
B)   ductus venosus
C)   umbilical artery
D)   umbilical vein
E)   foramen ovaleF) B) and D)
G) None of the above

Question 3

Oxygenated blood reaches the fetus through the __________.

Accepted Answer

A)   umbilical vein
B)   umbilical arteries
C)   maternal vein
D)   maternal arteries
E)   placental sinusF) A) and B)
G) A) and C)

Question 4

As it implants,the conceptus is nourished by means of __________.

Accepted Answer

A)   trophoblastic nutrition
B)   uterine milk
C)   nutrient diffusion from the endometrium
D)   placenta
E)   umbilical nutritionF) A) and B)
G) A) and E)

Question 5

Which of the following is not a reason muscular weakness tends to develop in old age?

Accepted Answer

A)   Aged muscle has less glycogen,myoglobin,and creatine phosphate.
B)   There are fewer motor neurons in the spinal cord.
C)   Aged muscle fibers have fewer myofibrils.
D)   There are fewer and smaller mitochondria in aged muscle.
E)   The myocytes of aged muscle no longer synthesize myosin.F) B) and C)
G) A) and E)

Question 6

Mesenchyme gives rise to __________.

Accepted Answer

A)   nervous tissue
B)   muscle,bone,and blood
C)   digestive organs and endocrine glands
D)   reproductive and urinary systems
E)   the integumentary system and exocrine glandsF) A) and B)
G) A) and C)

Question 7

The embryonic stage extends from 16 days through the end of week 8.

Accepted Answer

A) True 
 B)False

Question 8

Older people may require lower drug doses than younger people because __________.

Accepted Answer

A)   their organs are more sensitive to drugs
B)   they have lower rates of renal clearance
C)   they do not absorb as much drug from the small intestine
D)   there is less tissue mass to treat
E)   a lifetime of mutations results in unpredictable drug reactionsF) None of the above
G) A) and D)

Question 9

During implantation,the trophoblast divides into a deep layer called the _________,which is composed of individual cells.

Accepted Answer

A)   chorion
B)   amnion
C)   syncytiotrophoblast
D)   cytotrophoblast
E)   embryoblastF) B) and D)
G) None of the above

Question 10

The observation that there is a limit to how many times a cell can divide is the basis for the __________ theory of senescence.

Accepted Answer

A)   autoimmune
B)   free radical
C)   cross-linking
D)   replicative
E)   abortiveF) A) and B)
G) A) and C)

Question 11

In the slow block to polyspermy,sperm penetration releases an inflow of __________,which in turn stimulates the __________.

Accepted Answer

A)   Cl-;corona radiata
B)   K+;zona pellucida
C)   Na+;fertilization membrane
D)   Ca2+;fertilization membrane
E)   Ca2+;cortical reactionF) B) and D)
G) A) and C)

Question 12

Cleavage results in daughter cells containing half the number of chromosomes of the parent cell.

Accepted Answer

A) True 
 B)False

Question 13

The process that makes it possible for sperm to penetrate the egg is called __________.

Accepted Answer

A)   sperm migration
B)   capacitation
C)   the cortical reaction
D)   morulation
E)   cleavageF) A) and B)
G) A) and E)

Question 14

The first body cavity is called the __________.

Accepted Answer

A)   coelom
B)   amniotic cavity
C)   yolk sac
D)   somite
E)   chorionF) B) and D)
G) B) and C)

Question 15

The optimal "window of opportunity" to conceive a child is __________.

Accepted Answer

A)   a few days before ovulation to less than a day after
B)   less than a day before ovulation to less than a day after
C)   a few days before ovulation to a few days after
D)   a few days before ovulation
E)   a few days after ovulationF) C) and D)
G) A) and E)

Question 16

Which of the following is not considered an embryonic membrane?

Accepted Answer

A)   Yolk sac
B)   Placenta
C)   Allantois
D)   Chorion
E)   AmnionF) A) and C)
G) B) and E)

Question 17

Which of the following statements is true regarding telomeres?

Accepted Answer

A)   Telomeres are cytoplasmic enzymes involved in senescence.
B)   Telomeres are antioxidants that slow the progress of senescence.
C)   Telomeres are DNA segments at each end of a chromosome.
D)   Telomeres are proteins that cap the ends of the chromosomes.
E)   Telomeres are motor molecules that guide embryonic cells to the right destinations.F) A) and D)
G) B) and C)

Question 18

The __________ completely encloses the embryo and provides it with a stable environment.

Accepted Answer

A)   yolk sac
B)   amnion
C)   chorion
D)   chorionic villus
E)   allantoisF) All of the above
G) B) and D)

Question 19

The most likely outcome of nondisjunction is the production of a gamete receiving __________.

Accepted Answer

A)   no chromosomes
B)   46 chromosomes
C)   44 chromosomes
D)   23 chromosomes
E)   22 chromosomesF) D) and E)
G) None of the above

Question 20

In the blastocyst,the trophoblast will become __________,whereas the embryoblast will become __________.

Accepted Answer

A)   part of the placenta;the yolk sac
B)   part of the placenta;the embryo
C)   the embryo;part of the placenta
D)   the embryo;the yolk sac
E)   the yolk sac;the embryoF) B) and D)
G) D) and E)

Exam 29: Human Development and Aging

As it implants,the conceptus is nourished by means of __________.

Correct AnswerverifiedShow Answer

The process that makes it possible for sperm to penetrate the egg is called __________.

Correct AnswerverifiedShow Answer

In the slow block to polyspermy,sperm penetration releases an inflow of __________,which in turn stimulates the __________.

Correct AnswerverifiedShow Answer

The observation that there is a limit to how many times a cell can divide is the basis for the __________ theory of senescence.

Correct AnswerverifiedShow Answer

The optimal "window of opportunity" to conceive a child is __________.

Correct AnswerverifiedShow Answer

During implantation,the trophoblast divides into a deep layer called the _________,which is composed of individual cells.

Correct AnswerverifiedShow Answer

Which of the following is not considered an embryonic membrane?

Correct AnswerverifiedShow Answer

Mesenchyme gives rise to __________.

Correct AnswerverifiedShow Answer

The first body cavity is called the __________.

Correct AnswerverifiedShow Answer

Which of the following statements is true regarding telomeres?

Correct AnswerverifiedShow Answer

Cleavage results in daughter cells containing half the number of chromosomes of the parent cell.

Correct AnswerverifiedShow Answer

The embryonic stage extends from 16 days through the end of week 8.

Correct AnswerverifiedShow Answer

The most likely outcome of nondisjunction is the production of a gamete receiving __________.

Correct AnswerverifiedShow Answer

Oxygenated blood reaches the fetus through the __________.

Correct AnswerverifiedShow Answer

The fossa ovalis is a remnant of the __________ of the fetus.

Correct AnswerverifiedShow Answer

The __________ completely encloses the embryo and provides it with a stable environment.

Correct AnswerverifiedShow Answer

In the blastocyst,the trophoblast will become __________,whereas the embryoblast will become __________.

Correct AnswerverifiedShow Answer

Older people may require lower drug doses than younger people because __________.

Correct AnswerverifiedShow Answer

Sperm must travel to the distal end of the uterine tube to encounter the egg before it dies.

Correct AnswerverifiedShow Answer

Which of the following is not a reason muscular weakness tends to develop in old age?

Correct AnswerverifiedShow Answer

Correct Answer
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In the slow block to polyspermy,sperm penetration releases an inflow of ,which in turn stimulates the .

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In the blastocyst,the trophoblast will become ,whereas the embryoblast will become .

Correct Answer
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