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The amnion is to the amniotic fluid as the allantois is to the


A) blood cell precursors.
B) chorionic villi.
C) umbilical blood vessels.
D) amniotic cavity.
E) yolk.

F) A) and B)
G) None of the above

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When cells take on specific structure and function, this is called


A) cleavage.
B) growth.
C) morphogenesis.
D) differentiation.
E) fertilization.

F) C) and E)
G) A) and B)

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Which of the following is not a chief effect of progesterone?


A) increased uterine blood flow
B) relaxation of smooth muscle
C) reduced uterine motility
D) reduced maternal immune response to fetus
E) low blood pressure

F) B) and D)
G) B) and C)

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A

Which of the following is involved in the prevention of polyspermy?


A) acrosome of the sperm
B) depolarization of the egg's plasma membrane
C) fusion of the sperm and egg nucleus
D) changes within the corona radiata
E) the number of chromosomes contained within the sperm

F) A) and B)
G) B) and D)

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The nervous system is to the ectoderm as the skeleton is to the


A) mesoderm.
B) endoderm.
C) chorion.
D) allantois.
E) blastula.

F) D) and E)
G) B) and C)

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The white, greasy, cheeselike substance that covers the skin is called


A) lanugo.
B) fontanels.
C) vernix caseosa.
D) foramen ovale.
E) ductus arteriosus.

F) A) and B)
G) C) and D)

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The adhering follicular cells that surround the egg are called the


A) pronuclei.
B) zona pellucida.
C) corona radiata.
D) cortical granule cells.
E) outer cell mass.

F) B) and E)
G) C) and D)

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The nervous system develops enough to permit reflex actions during which period of development?


A) pre-embryonic
B) embryonic, weeks 6 - 8
C) fetal, months 3 - 4
D) embryonic, weeks 2 - 3
E) embryonic, weeks 4 - 5

F) B) and C)
G) A) and B)

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Which of the following problems is not associated with pregnancy?


A) lordosis
B) lower back pain
C) gastrointestinal reflux
D) incontinence
E) impotence

F) C) and E)
G) C) and D)

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Which of the following would be considered a poor health practice for a woman planning to get pregnant or already pregnant?


A) updating all vaccinations
B) treating all sexually transmitted diseases
C) obtaining more folic acid
D) eating enough to feed two people
E) moderate exercise

F) A) and B)
G) C) and E)

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D

Which of the following skin changes is not associated with growing older?


A) Pigmented blotches appear on the skin.
B) There is less adipose tissue in the subcutaneous layer.
C) The number of elastic fibers decreases.
D) There is an increase in the number of oil glands.
E) There are fewer sweat glands for sweating to occur.

F) D) and E)
G) A) and D)

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At the end of the embryonic period, the embryo is about 12 inches long.

A) True
B) False

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When does the heart begin to develop?


A) one week
B) three weeks
C) five weeks
D) seven weeks
E) nine weeks

F) None of the above
G) A) and E)

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During fertilization, several sperm penetrate the corona radiata.

A) True
B) False

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Development ceases at birth.

A) True
B) False

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If Dan lives longer than his father did because Dan takes better care of himself than his father did, this supports which theory of aging?


A) genetic in origin
B) whole-body process
C) extrinsic factors
D) influence of telomeres
E) influence of hormones

F) A) and E)
G) B) and E)

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The names of the extraembryonic membranes are derived from their function in animals that produce shelled eggs.

A) True
B) False

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True

Embryonic development begins with


A) fertilization.
B) the first cell division.
C) the development of the blastocyst.
D) implantation.
E) gastrulation.

F) A) and E)
G) A) and D)

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Describe what occurs during cleavage, growth, morphogenesis, and differentiation.

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CLEAVAGE IS THE DIVISION OF THE ZYGOTE F...

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Which of the following is not derived from the endoderm?


A) epithelial lining of digestive tract
B) epithelial lining of respiratory tract
C) glands of the digestive tract
D) lining of the urinary bladder
E) urinary system

F) B) and C)
G) A) and C)

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