31) Three weeks after conception, which of the following has : 1380983

31) Three weeks after conception, which of the following has : 1380983. 31) Three weeks after conception, which of the following has : 1380983.



31) Three weeks after conception, which of the following has happened in an embryo?

A) organ formation

B) neural tube formation

C) limb bud formation

D) primitive eye formation


32) Immature versions of all the major organ systems have formed by about what point in pregnancy?

A) 16 days

B) 3 weeks

C) 12 weeks

D) not until at least 30 weeks


33) Which of the following best describes the period during which the developing offspring is considered a fetus?

A) from fertilization to three weeks

B) from fertilization to eight weeks

C) the first trimester only

D) the third trimester only

E) from nine weeks until birth


34) Which of these becomes the baby?

A) outer cell mass

B) trophoblast

C) inner cell mass

D) placenta


35) When does the fetus achieve about 15 percent of its birth weight and start kicking?

A) at the end of embryonic phase

B) at the start of organogenesis

C) in the first trimester

D) in the second trimester

E) in the third trimester

36) Why is production of lung surfactant important for a baby?

A) Without lung surfactant, the baby’s lungs do not develop properly.

B) Lung surfactant may block the placenta from exchanging oxygen.

C) Lung surfactant keeps the lung sacs from collapsing.

D) Lung surfactant keeps the lungs from sticking to the diaphragm.


37) How many sperm participate in the formation of fraternal twins?

A) one

B) two

C) three

D) four


38) In the human birth process, what does labor refer to?

A) the period between birth and expulsion of the placenta

B) the period between the first contraction and dilation of the cervix

C) the last part of the process when the fetus is expelled from the vagina

D) regular contractions of uterine muscles


39) Which hormone stimulates the muscular contractions associated with birth of a child?

A) estrogen

B) progesterone

C) luteinizing hormone

D) oxytocin


40) What is the “afterbirth” associated with the birth process?

A) the amniotic fluid

B) the blood lost from the uterus in the weeks after birth

C) the placenta

D) the process of cutting the umbilical cord

41) How much does the cervix ultimately dilate during labor?

A) 10 centimeters

B) 5 centimeters

C) 3 centimeters

D) 1 centimeter





31) Three weeks after conception, which of the following has : 1380983

31) Three weeks after conception, which of the following has : 1380983

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