Pregnancy

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.calcium ion b.sodium ion c.ATP d.phosphate ion

a.calcium ion

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

a.ductus arteriosus-ligamentum teres

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

a.ectoderm

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

a.expulsion stage

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

a.human chorionic gonadotropin

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

a.oxytocin

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

a.placental

Protective water-filled embryonic sac surrounding the embryo.

amnion

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

b.Millions of sperm cells are destroyed by the vagina's acidic environment.

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

b.The umbilical vein becomes the ligamentum teres.

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

b.estrogens and progesterone

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

b.fertilization

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

b.gastrula

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

b.mesoderm

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

b.vasectomy

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

b.zygote, morula, blastocyst

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

c.12-24 hours

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

c.implantation

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

d.a nonfunctional zygote

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

d.nutrients, respiratory gases, wastes, and alcohol

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

d.placental tissue

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

d.the part of the endometrium that lies beneath the embryo

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

d.the syncytiotrophoblast

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

d.they undergo capacitation

The part of the endometrium destined to be a part of the placenta.

decidua basalis

Site of early blood cell production, and forms part of the gut (digestive tube)

yolk sac