AP Biology : Reproductive System
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Example Question #1344 : Ap Biology
Which part of the developing blastocyst becomes the placenta in mammals?
Yolk
Embryoblast
Blastocoel
Trophoblast
Trophoblast
The trophoblast is a layer of cells that surround the blastocyst. The trophoblast becomes the outer layer of the placenta and further differentiates into syncytiotrophoblast and cytotrophoblast cells that contribute to placentation.
Example Question #141 : Reproductive Physiology
Which of the following choices connects the developing fetus to the maternal placenta?
Amniotic sac
Fetal villi
Endometrial villi
Umbilical cord
Umbilical cord
During fetal development, the umbilical cord is a structure that connects the fetus to the maternal placenta. The umbilical cord contains umbilical arteries and the umbilical vein, allowing oxygen, nutrient, and waste exchange between the mother and fetus. It develops from the yolk sac and allantois in the fifth week of development and is clamped or cut following childbirth.
Example Question #71 : Understanding Other Reproductive Physiology
Which of the following is not true regarding Braxton Hicks contractions?
They are uterine contractions
They signify the beginning of labor
They occur throughout pregnancy
They prepare the mother for childbirth
They signify the beginning of labor
Braxton Hicks contractions are mild and irregular uterine contractions that are believed to prepare the mother for childbirth. The contractions may begin during the first trimester, but are often only noticed during the second and third trimesters of pregnancy.
Example Question #1347 : Ap Biology
Which of the following muscles contra to help deliver the baby during labor?
Uterine
Fallopian
Cervical
Vaginal
Uterine
During labor, uterine contractions help dilate the cervix and descend the baby into the birth canal. As labor progresses, contractions become regular and occur more frequently. As the contractions continue to bear down on the fetus, the labor process is aided by maternal pushing.
Example Question #72 : Understanding Other Reproductive Physiology
Which of the following best describes the direct effect of uterine contractions during labor?
Neither fetal descent nor cervical dilation
Fetal descent
Cervical dilation
Both cervical dilation and fetal descent
Both cervical dilation and fetal descent
Uterine contractions during labor help the fetus descend into the birth canal and aid cervical dilation.
Example Question #72 : Understanding Other Reproductive Physiology
Which of the following best describes what occurs physiologically when a woman’s “water breaks”?
Descent of the baby into the birth canal
Expulsion of the placenta
Rupture of the amniotic sac
Detachment of the umbilical cord
Rupture of the amniotic sac
The rupture of the amniotic sac during birth is commonly said to be when a woman’s “water breaks.” This typically occurs at the beginning of labor, but sometimes has to be ruptured by a medical professional. The rupture decreases cushioning of the fetus and increases pressure of the contractions, aiding the descent of the fetus into the birth canal.
Example Question #1350 : Ap Biology
Which of the following best describes when a pregnancy is considered to be “full term”?
30 to 31 weeks
37 to 38 weeks
39 to 41 weeks
33 to 35 weeks
39 to 41 weeks
A woman is said to be “full term” when she is at 39 to 41 weeks of pregnancy. Medical intervention to induce labor during this time is not ideal.
Example Question #1351 : Ap Biology
Which of the following is a complication associated with pregnancy?
Ectopic pregnancy
Anemia
Preeclampsia
Postpartum depression
All of these
All of these
Pregnancy related medical conditions and complications are incredibly common due to strain on the mother and extreme biological changes associated with pregnancy. Examples include postpartum depression, anemia, preeclampsia, and ectopic pregnancy.
Example Question #1351 : Ap Biology
Which of the following best describe methods that are used to prevent premature births?
Nutritional supplements
Reducing the mother's activity
Screening for complications
Avoiding stress
All of these
All of these
Premature birth is the leading cause of death in newborns. While the exact causes of premature birth are not completely understood, certain methods may work to prevent it. These methods include nutritional supplements, avoiding stress, screening for complications, and reduction in activity.
Example Question #1353 : Ap Biology
Which of the following must occur in order to deliver the shoulders of the fetus?
The mother needs to stop pushing
None of these
Release of the placenta
Fetal rotation in the birth canal
Breech of the fetus
Fetal rotation in the birth canal
In order to deliver the fetal shoulders, the fetus needs to rotate in the birth canal.
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