Biology

Pregnancy and Childbirth

996 Questions

This hub covers essential biology questions on pregnancy, fetal development, and childbirth. Topics include the placenta, maternal physiology, and the stages of labor. These concepts are frequently tested in general science sections of various competitive examinations.

Placenta and fetal nutritionStages of laborMaternal immune systemPregnancy complications

Pregnancy and Childbirth Questions

Multiple choice
  1. Contractility of the heart of a foetus is independent of preload and afterload.

  2. In a foetus, blood pressure = stroke volume X heart rate.

  3. Left-to-right shunting across the duct is normal in the developing fetus.

  4. The fetal heart does not start pumping blood until 8–10 weeks because the placenta performs this function.

  5. The ductus arteriosus in the developing fetus can be kept open by the use of ibuprofen or indomethacin but these have some side effects.

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Unlike stroke volume, contractility is independent of preload and afterload and is an innate property of myofibrils. It can be influenced by inotropes (e.g. dobutamine).

Multiple choice
  1. IgA

  2. IgD

  3. IgE

  4. IgG

  5. IgM

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Maternal IgG is transferred across the placenta from the mother to the fetus by a mechanism involving the specific Fc gamma receptor FcRn IgG is the only immunoglobulin class to cross the placenta. Immunoglobulins in the milk (mostly secretory IgA) will provide enteric protection for the baby, but are not absorbed. Thus the maternal immunoglobulin in the circulation of a 2-month-old-baby will mostly be placentally-transferred IgG, which will provide 'cover' for the first few months of life.

Multiple choice
  1. IgA

  2. IgD

  3. IgE

  4. IgG

  5. IgM

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

IgG is the only class of immunoglobulin which is acquired by the neonate by placental transfer from the mother. This process is dependent upon Fc structures specific to this Ig class. The maternal IgG is catabolized with a half-life of approximately 23 days.

Multiple choice
  1. Ovulation induction

  2. ICSI with single embryo transfer

  3. Natural conception

  4. Family history of multiple pregnancy

  5. Maternal age 35–39 years

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This increases the risk of monochorionic monoamniotic (MCMA) twins by 5 times;  the reasons for this are poorly understood.

Multiple choice
  1. Singleton pregnancy

  2. Dichorionic diamniotic (DCDA) twins

  3. Monochorionic diamniotic (MCDA) twins

  4. Monochorionic monoamniotic (MCMA) twins

  5. Disappearing twin

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pregnancies that share the placenta and amnion are at highest risk of adverse outcome because of risk of twin-to-twin transfusion syndrome and cord entanglement.

Multiple choice
  1. Malformations in a developing foetus occur due to insults in the second or third trimester.

  2. An abnormal uterus or breech position does not cause limb abnormalities in a developing foetus.

  3. Deformities of the skull bones in a developing foetus are extremely rare and need urgent neurosurgical referral.

  4. Talipes equinovarus riverts best to early corrective surgery.

  5. Congenital anomaly in a developing foetus helps in the identification of a teratogenic source.

Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

It is important to monitor congenital abnormalities to understand their aetiology. Preconception folic acid supplementation to prevent spina bifida shows the benefit of recognizing high-risk groups.

Multiple choice

Children born out of unplanned pregnancies are highly vulnerable because _____.

Directions: Read the following passage & answer the question. 
Though the U.S. prides itself on being a leader in the world community, a recent report shows that it lags far behind other industrialized countries in meeting the needs of its youngest and most vulnerable citizens. The U.S. has a higher infant mortality rate, a higher proportion of low birth weight babies, a smaller proportion of babies immunized against childhood diseases and a much higher rate of adolescent pregnancies. These findings, described as a “quiet crisis requiring immediate and far-reaching action, appeared in a report prepared by a task force of educators, doctors, politicians and business people. According to the report, a fourth of the nation’s 12 million infants and toddlers live in poverty. As many as half confront risk factors that could harm their ability to develop intellectually, physically and socially. Child immunization is too low, more children are born into poverty, more are in substandard care while their parents work and more being raised raised by single parents. When taken together these and other risk factors can lead to education and health problems that are much harder and more costly to reverse.
>            The crisis begins in the womb with unplanned parenthood. Women with unplanned pregnancies are less likely to seek pre-natal care. In the U.S. 80% of teenage pregnancies and 56% of all pregnancies are unplanned. The problems continue after birth where unplanned pregnancies and unstable partnerships often go hand in hand. Since 1950, the number of single parent families has nearly tripled. More then 25 percent of all births today are to unmarried mothers. As the number of single parent families grow and more women enter the work force, infants and toddlers are increasingly in the care of people other than their parents.
            Most disturbingly, recent statistics show that American parent are increasingly neglecting or abusing their children, in only four years from 1987-1971 the number of children in foster care increased by over 50 percent. Babies under the age of one are the fastest growing category of children entering foster care. The crisis affects children under the age of three most severely, the report says. Yet, it is this period from infancy through preschool years that sets the stage for a child’s future.

 

  1. they are raised by single parents

  2. their parents are mostly poor

  3. they are mostly malnourished

  4. they are less likely to receive parental care

  5. their parents are emotionally immature

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

   As the number of single parent families grow and more women enter the work force, infants and toddlers are increasingly in the care of people other than their parents. 

Multiple choice

The number of children born to married mothers in the U.S. is approximately how many times the number of children born to unwed mothers?

Directions: Read the following passage & answer the question. 
Though the U.S. prides itself on being a leader in the world community, a recent report shows that it lags far behind other industrialized countries in meeting the needs of its youngest and most vulnerable citizens. The U.S. has a higher infant mortality rate, a higher proportion of low birth weight babies, a smaller proportion of babies immunized against childhood diseases and a much higher rate of adolescent pregnancies. These findings, described as a “quiet crisis requiring immediate and far-reaching action, appeared in a report prepared by a task force of educators, doctors, politicians and business people. According to the report, a fourth of the nation’s 12 million infants and toddlers live in poverty. As many as half confront risk factors that could harm their ability to develop intellectually, physically and socially. Child immunization is too low, more children are born into poverty, more are in substandard care while their parents work and more being raised raised by single parents. When taken together these and other risk factors can lead to education and health problems that are much harder and more costly to reverse.
>            The crisis begins in the womb with unplanned parenthood. Women with unplanned pregnancies are less likely to seek pre-natal care. In the U.S. 80% of teenage pregnancies and 56% of all pregnancies are unplanned. The problems continue after birth where unplanned pregnancies and unstable partnerships often go hand in hand. Since 1950, the number of single parent families has nearly tripled. More then 25 percent of all births today are to unmarried mothers. As the number of single parent families grow and more women enter the work force, infants and toddlers are increasingly in the care of people other than their parents.
            Most disturbingly, recent statistics show that American parent are increasingly neglecting or abusing their children, in only four years from 1987-1971 the number of children in foster care increased by over 50 percent. Babies under the age of one are the fastest growing category of children entering foster care. The crisis affects children under the age of three most severely, the report says. Yet, it is this period from infancy through preschool years that sets the stage for a child’s future.

 

  1. 1.5 times

  2. 2 times

  3. 3 times

  4. 3.5 times

  5. Not mentioned in the passage

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 3 times.

Multiple choice
  1. endocrine gland

  2. digestive gland

  3. sense organ

  4. pumping organ of blood

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Placenta is a hugely important endocrine organ, producing many hormones which affect the status of pregnancy and the maternal physiology. The Placenta is a hugely important endocrine organ, producing many hormones which affect the status of pregnancy and the maternal physiology.

Multiple choice
  1. womb

  2. placenta

  3. lungs

  4. gallbladder

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Surfactant is a complex naturally occurring substance made of six lipids (fats) and four proteins that is produced in the lungs. It can also be manufactured synthetically. Surfactant reduces the surface tension of fluid in the lungs and helps make the small air sacs in the lungs (alveoli) more stable. This keeps them from collapsing when an individual exhales.

Multiple choice
  1. Maternal IgG is placentally transferred from 32 to 40 weeks of gestation.

  2. IgM is the first Ig to be made in the fetus.

  3. Most maternal IgG has been catabolized in a normal infant by 12 to 24 weeks of life.

  4. Breast milk IgA is absorbed by the infant's small intestine for up to 6 months of life.

  5. IgM antibodies does not pass across the human placenta.

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Human infants do not absorb oral IgA from colostrum or milk, unlike lambs.