Exam 3: Biological Foundations, Prenatal Development, and Birth

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Describe common labor and delivery medications in the United States, and give the possible problems associated with their use.

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Although natural childbirth techniques lessen or eliminate the need for pain-relieving drugs, some form of medication is used in more than 80 percent of U.S. births. Analgesics, drugs used to relieve pain, may be given in mild doses during labor to help a mother relax. Anesthetics are a stronger type of painkiller that blocks sensation. Currently, the most common approach to controlling pain during labor is epidural analgesia, in which a regional pain-relieving drug is delivered continuously through a catheter into a small space in the lower spine. Unlike older spinal block procedures, which numb the entire lower half of the body, epidural analgesia limits pain reduction to the pelvic region. Because the mother retains the capacity to feel the pressure of contractions and to move her trunk and legs, she is able to push during the second stage of labor. Although pain-relieving drugs help women cope with childbirth and enable doctors to perform essential medical interventions, they also cause problems. Epidural analgesia, for example, weakens uterine contractions. As a result, labor is prolonged, and the chances of cesarean (surgical) delivery increase. And because drugs rapidly cross the placenta, exposed newborns tend to have lower Apgar scores, to be sleepy and withdrawn, to suck poorly during feedings, and to be irritable when awake. Although no confirmed long-term consequences for development exist, the negative impact of these drugs on the newborn's adjustment supports the current trend to limit their use.

Victoria carries the abnormal allele for hemophilia. Which of the following children is most likely to inherit the disorder?

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C

The most frequent prenatal infection is

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C

Which of the following statements is true about teratogens?

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Usually, __________ is used to treat women whose fallopian tubes are permanently damaged.

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Which of the following statements summarizes the long-term consequences of birth complications found in Emmy Werner's Kauai study?

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Breech babies often experience a cesarean delivery because of the danger of

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High rates of miscarriage, physical deformities, and slow physical growth have occurred in __________ due to __________.

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In a typical natural childbirth program, the expectant mother and a companion participate in

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Folic acid taken around the time of conception can lower the incidence of __________, and taken during the last 10 weeks of pregnancy cuts in half the risk of __________.

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Researchers use __________ to infer the role of heredity in complex human characteristics.

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On the job, Mr. Williams was exposed to high doses of radiation. Because of this exposure, when planning their family, the Williams' should be concerned about

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Each person is made up of trillions of __________ and 23 __________.

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The effects of teratogens

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From the __________, tiny __________ emerge, which burrow into the uterine wall and start to develop the placenta.

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The risk of bearing a baby with Down syndrome rises dramatically with

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Which of the following statements is true about teratogens during the fetal period?

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The sex of a new organism is determined by

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Gametes are

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Which of the following statements is true about sex differences?

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