Exam 24: Pregnancy Human Development

A) It is the shortest stage of labor.
B) It begins after the rupture of fetal membranes.
C) It is the stage in which the top of the baby's head first appears.
D) It ends when the cervix is fully dilated.

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A) The germ layers are an inner cell mass that flattens to form the embryonic disc.
B) The germ layers are an inner cell mass that separates from the trophoblast to create the amniotic cavity.
C) The germ layers are shoots sent out by the trophoblast to gain nourishment from the endometrium.
D) The germ layers are three layers that arise from the embryonic disc and produce all the organs and tissues of the body.

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A) An increase in progesterone
B) A decline in estrogen
C) The release of oxytocin
D) Fetal movement

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A) First trimester
B) Second trimester
C) The last week of the first trimester
D) Third trimester

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A) Respiratory difficulty,because blood is bypassing the lungs
B) Increased levels of toxins in the blood,because blood is bypassing the liver
C) Decreased urine output,because blood is bypassing the kidneys
D) Decreased nutrition,because blood is bypassing the stomach

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A) fetal stage.
B) zygotic stage.
C) embryonic stage.
D) pre-embryonic stage.

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A) two umbilical arteries and one umbilical vein.
B) two umbilical arteries and two umbilical veins.
C) one umbilical artery and one umbilical vein.
D) one umbilical artery and two umbilical veins.

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A) The placenta becomes functional
B) The beginning of the fetal heartbeat
C) The formation of the germ layers
D) The development of a yolk sac

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C

A) umbilical arteries.
B) umbilical vein.
C) lacunae.
D) chorionic villi.

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A) It shunts blood from the right into the left atrium.
B) It shunts blood around the liver.
C) It shunts blood from the right ventricle to the pulmonary artery.
D) It shunts blood around the kidneys.

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A) Oxygenated blood flows from the placenta to the fetus through the umbilical arteries.
B) Maternal and fetal blood mix in the placenta.
C) The placenta secretes hormones necessary for the continuation of pregnancy.
D) The placenta effectively screens nicotine,alcohol and most drugs,thus protecting the fetus.

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C

A) The amnion is filled with fluid that supplies the embryo with nutrition.
B) The amnion begins to develop at the time of conception.
C) The fetus "breathes" and swallows the fluid in the amniotic sac.
D) The fluid volume in the amnion remains stable because it is fed by the maternal blood supply.

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C

A) Prolactin
B) Oxytocin
C) Estrogen
D) Progesterone

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A) cardiac muscle.
B) the epidermis.
C) the nervous system.
D) the thyroid gland.

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A) Amnion
B) Chorion
C) Allantois
D) Yolk sac

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