Review Chapter 28 Pregnancy

Using this figure, match the following Protective water-filled embryonic sac surrounding the embryo. The part of the endometrium destined to be a part of the placenta. Site of early blood cell production, and forms part of the gut (digestive tube).

C A D

Neural tissue is formed by the ________. a.ectoderm b.endoderm c.epiderm d.mesoderm

a

The correct sequence of preembryonic structures is ________. a.zygote, morula, blastocyst b.morula, zygote, blastocyst c.blastocyst, morula, zygote d.zygote, blastocyst, morula

a

The result of polyspermy in humans is ________. a.a nonfunctional zygote b.interruption of meiosis c.multiple births d.mitotic insufficiency

a

The trophoblast is mostly responsible for forming the ________. a.placental tissue b.archenteron c.allantois d.lining of the endometrium

a

At what point is meiosis II completed for the female gamete? a.ovulation b.fertilization c.puberty d.implantation

b

How long is the secondary oocyte viable and capable of being fertilized after it is ovulated? a.a full week b.12-24 hours c.36-72 hours d.24-36 hours

b

It is impossible for sperm to be functional (able to fertilize the egg) until after ________. a.they become spermatids b.they undergo capacitation c.they have been stored in the uterus for several days d.the tail disappears

b

The corpus luteum prevents loss of the implanted embryo through menstruation by secreting ________. a.follicle-stimulating hormone b.estrogens and progesterone c.human chorionic gonadotropin d.luteinizing hormone

b

Which of the following is true in reference to what may pass through the placental barriers? a.respiratory gases, hormones, nutrients, and blood cells b.nutrients, respiratory gases, wastes, and alcohol c.nutrients and respiratory gases only d.hormones, blood cells, and nutrients

b

In the block to polyspermy, entry of the sperm's contents causes ________ levels in the oocyte's cytoplasm to rise, triggering the cortical reaction. a.sodium ion b.ATP c.calcium ion d.phosphate ion

c

Which method of contraception is most reliable? a.cervical cap b.morning-after pills c.vasectomy d.rhythm method

c

Which of the following is NOT a correct matching of a fetal structure with what it becomes at birth? a.umbilical arteries-medial umbilical ligaments b.foramen ovale-fossa ovalis c.ductus arteriosus-ligamentum teres d.ductus venosus-ligamentum venosum

c

A urine test reveals a positive result for human chorionic gonadotropin (hCG). This indicates ________ was successful. a.fertilization b.ovulation c.gastrulation d.implantation

d

At which stage of labor is the "afterbirth" expelled? a.dystocia b.full dilation c.expulsion d.placental

d

During which stage of labor is the fetus delivered? a.gastrula stage b.dilation stage c.placental stage d.expulsion stage

d

Milk ejection (the letdown reflex) is stimulated by which of the following hormones associated with pregnancy? a.inhibin b.prolactin c.gonadotropin d.oxytocin

d

Muscle tissue is formed by the ________. a.epiderm b.ectoderm c.endoderm d.mesoderm

d

Select the correct statement about fertilization. a.If estrogen is present, the pathway through the cervical opening is blocked from sperm entry. b.Both spermatozoa and the ovulated secondary oocyte remain viable for about 72 hours in the female reproductive tract. c.Once inside the uterus, most sperm cells are protected and remain viable. d.Millions of sperm cells are destroyed by the vagina's acidic environment.

d

Select the correct statement about the special fetal blood vessels. a.The fossa ovalis becomes the foramen ovale. b.The distal parts of the umbilical arteries form the superior vesical arteries. c.The hepatic portal vein forms from the umbilical artery. d.The umbilical vein becomes the ligamentum teres.

d

The decidua basalis is ________. a.not a maternal contribution to the placenta b.destined to remain in the uterus after the birth of the infant c.the tissue that surrounds the uterine cavity face of the implanted embryo d.the part of the endometrium that lies beneath the embryo

d

The presence of endoderm, ectoderm, and mesoderm is first seen in the ________ stage. a.fetal b.morula c.blastocyst d.gastrula

d

Which embryonic structure produces human chorionic gonadotropin (hCG)? a.the cytotrophoblast b.the epiblast c.the hypoblast d.the syncytiotrophoblast

d

Which hormone maintains the viability of the corpus luteum? a.human placental lactogen b.progesterone c.estrogen d.human chorionic gonadotropin

d