test 101D Flashcards
(150 cards)
The germinal period ends approximately:
a. two days after conception.
b. two months after conception.
c. two weeks after conception.
d. twelve weeks after conception.
two weeks after conception.
The period of the fetus lasts:
a. during the last three months before the child’s birth.
b. from the midway point of prenatal development until birth.
c. from the second until the eighth week after conception.
d. from nine weeks after conception until birth.
d. from nine weeks after conception until birth.
The longest period of prenatal development is the:
a. period ofthe embryo.
b. period ofthe fetus.
c. first trimester.
d. germinal period.
b. period ofthe fetus
Full-term pregnancies last:
a. 34 weeks.
b. 36 weeks.
c. 38 weeks.
d. 40 weeks.
c. 38 weeks
The germinal stem cells first take on distinct characteristics and move toward particular locations
during:
a. implantation.
b. differentiation
c. assimilation.
d. fertilization.
differentiation
About a week after conception, the outer layer of the multiplying cells forms a protective circle or shell
that will become the:
a. placenta.
b. umbilical cord.
c. vernix.
d. infant.
a. placenta
By one week after conception, the multiplying cells have divided into outer cells enclosing a mass of
inner cells. The inner cells will become the:
a. embryo.
b. amnion.
c. placenta.
d. digestive system
a. embryo.
The placenta:
a. screens the embryo from all harmful substances.
b. provides the fetus with its first taste of breast milk.
c. surrounds and protects the developing organism.
d. mixes the blood supply of mother and fetus
c. surrounds and protects the developing organism.
During the germinal period, the first task ofthe outer cells is to:
a. divide as rapidly as possible.
b. differentiate into different types oftissue.
c. implant in the uterus.
d. find a permanent location in the ovaries.
c. implant in the uterus.
Which occurs about 7 days after conception?
a. deposit ofthe male’s sperm into the body ofthe female
b. nestling of the developing organism into the lining of the uterus
c. fertilization of the ovum by sperm
d. the placenta begins to function
c. fertilization ofthe ovum by sperm
Which ofthe following is a true statement?
a. All infants of HIV-positive women contract the HIV virus as well.
b. A teratogen is a substance or disease that, when present, always results in a birth defect.
c. Months 4, 5, and 6 are referred to as the second or middle trimester of pregnancy.
d. There is no real evidence that the fetus can hear anything.
. Months 4, 5, and 6 are referred to as the second or middle trimester of pregnancy.
The head begins to take shape in the_week after conception.
a. fourth
b. fifth
c. sixth
d. seventh
a. Fourth
Buds that will become arms and legs appear by the_week.
a. third
b. fourth
c. fifth
d. sixth
C. Fifth
Which ofthe following begins to develop last during prenatal development?
a. legs
b. hands
c. head
d. toes
d. toes
At eight weeks after conception, the embryo has not yet formed:
a. intestines.
b. lungs.
c. sex organs.
d. kidneys
c. sex organs
About eight weeks after eonception, the embryo:
a. weighs about 5 ounces (142 g).
b. has distinct fingers and toes.
c. has a visible tail.
d. is about 1/4 inch long (.64 cm).
b. has distinct fingers and toes.
The fetus begins to develop male sex organs if:
a. the Y chromosome sends a biochemical signal.
b. the master signal from the Y chromosome overrides the X signal.
c. the X chromosome sends a biochemical signal.
d. no biochemical signal is received.
a. the Y chromosome sends a biochemical signal.
The critical factor in attaining the age of viability is:
a. weighing at least 5 pounds (2.3 kg).
b. having adequate brain development.
c. having functioning digestive and respiratory systems.
d. surviving at least 28 weeks past conception.
b. having adequate brain development.
A birth weight of between 2 and 3 1/2 lbs. would be classified as:
a. low birth weight.
b. very low birth weight.
c. extremely low birth weight.
d. normal, though low
b. very low birth weight.
Which ofthese statements is a true one?
a. The development ofthe central nervous system is completed during the period ofthe embryo.
b. In the last months of prenatal life, the lungs begin to expand and contract and the valves ofthe
heart undergo final maturation.
c. A baby cannot be both preterm and small-for-date.
d. The cry ofthe newborn can earn a 3, the highest score for respiratory effort on the Apgar scale
In the last months of prenatal life, the lungs begin to expand and contract and the valves ofthe
heart undergo final maturation
The condition which causes part ofthe brain not to form is known as:
a. microcephaly.
b. anencephaly.
c. macrocephaly.
d. encephalitis
b. anencephaly.
Martha Ann was still-born. The doctors told her mother that the part ofthe brain above her eyebrowlevel had failed to form, prenatally. This sad problem was probably caused by:
a. a sexually transmitted disease.
b. toxoplasmosis. ,
c. a lack of folic acid in her mother’s diet.
d. household cleaning compounds.
c. a lack of folic acid in her mother’s diet
Research in genetic vulnerability to teratogens has found that:
a. fraternal twins are equally vulnerable.
b. female embryos are more vulnerable than males.
c. genetic vulnerability guarantees a birth defect ofsome sort.
d. the XY chromosome pattern is more susceptible to damage.
d. the XY chromosome pattern is more susceptible to damage.
Precise prediction ofinteraction between genes and teratogens is possible for:
a. male embryos but not female embryos.
b. all embryos.
c. monozygotic twins.
d. none ofthe above
d. none ofthe above