BIOLOGY PROJECT
NAME
: PHILLIP LEACH
TEACHER
: MRS. REID-DOUGLAS
SUBJECT
: BIOLOGY
CLASS
: 12 NATURAL SCIENCE
DATE
: FEBRURARY 29,2016
The Possible Effects of Maternal Behaviour on Foetal Development
Nutrition
Nutrition is the major intrauterine environmental factor that alters expression of the fetal genome
and may have lifelong consequences. Namely, alterations in fetal nutrition and endocrine status
may result in developmental adaptations that permanently change the structure, physiology, and
metabolism of the offspring, thereby predisposing individuals to metabolic, endocrine, and
cardiovascular diseases in adult life. Animal studies show that both maternal under nutrition and
over nutrition reduce placental-fetal blood flows and stunt fetal growth. Impaired placental
syntheses of nitric oxide (a major vasodilator and angiogenesis factor) and polyamines (key
regulators of DNA and protein synthesis) may provide a unified explanation for intrauterine
growth retardation in response to the 2 extremes of nutritional problems with the same pregnancy
outcome. There is growing evidence that maternal nutritional status can alter the epigenetic state
of the fetal genome. Promoting optimal nutrition will not only ensure optimal fetal development,
but will also reduce the risk of chronic diseases in adults.
Maternal nutrition plays a critical role in fetal growth and development. Although considerable
effort has been directed towards defining nutrient requirements of animals over the past 30 years,
suboptimal nutrition during gestation remains a significant problem for many animal species.
Maternal under nutrition during gestation reduces placental and fetal growth of both domestic
animals and humans. Available evidence suggests that fetal growth is most vulnerable to
maternal dietary deficiencies of nutrients during the peri-implantation period and the period of
rapid placental development. Under nutrition in pregnant women may result from low intake of
dietary nutrients owing to either a limited supply of food or severe nausea and vomiting known
as hyperemesis gravidarum. Pregnant women may also be at increased risk of under nutrition
because of early or closely-spaced pregnancies. Since pregnant teenage mothers are themselves
growing, they compete with their own fetuses for nutrients, whereas short interpregnancy
intervals result in maternal nutritional depletion at the outset of pregnancy. Low birth weights
and preterm deliveries in adolescent pregnancies are more than twice as common as in adult
pregnancies, and neonatal mortality in adolescent pregnancies is almost three times higher than
for adult pregnancies. Further, placental insufficiency results in reduced transfer of nutrients
from mother to fetus, thereby leading to fetal under nutrition and IUGR. Finally, due to
competition for nutrients, multiple fetuses resulting from assisted reproductive technologies are
often at risk of under nutrition and therefore fetal growth restriction. Thus, various nutritional
and pathological conditions can result in IUGR.
Pregnant women are usually recommended to avoid soft cheeses, smoked fish, precooked meats
and foods made with unpasteurized milk. These foods may contain a bacterium called Listeria.
This bacterium does not usually cause people much harm, but even a mild infection in a pregnant
woman may cause miscarriage.
Alcohol abuse
Drinking alcohol when you're pregnant can be very harmful to your baby. It can cause your baby
to have a range of lifelong health conditions. Drinking alcohol during pregnancy can cause
miscarriage, preterm birth and stillbirth.
When you drink alcohol during pregnancy, so does your baby. The same amount of alcohol that
is in your blood is also in your baby's blood. The alcohol in your blood quickly passes through
the placenta and to your baby through the umbilical cord.
Although your body is able to manage alcohol in your blood, your baby's little body isn't. Your
liver works hard to break down the alcohol in your blood. But your baby's liver is too small to do
the same and alcohol can hurt your baby's development. That's why alcohol is much more
harmful to your baby than to you during pregnancy.
Alcohol can lead your baby to have serious health conditions, called fetal alcohol spectrum
disorders (FASD). The most serious of these is fetal alcohol syndrome (FAS). Fetal alcohol
syndrome can seriously harm your baby's development, both mentally and physically.
Alcohol can also cause your baby to:
Have birth defects (heart, brain and other organs)
Vision or hearing problems
Be born too soon (preterm)
Be born at low birth weight
Have intellectual disabilities
Have learning and behavior problems
Have sleeping and sucking problems
Have speech and language delays
Have behavioral problems
Use of illegal and illicit drugs
It's possible that you may not have a serious or long-lasting problem after using drugs. But the
same is not always true for a fetus. Drug-using mothers often give birth to "drug babies." These
children have a host of developmental problems.
Studies show that using drugs -- legal or illegal -- during pregnancy has a direct impact on
the fetus. If you smoke, drink alcohol, or ingest caffeine, so does the fetus. If you use marijuana
or crystal meth, your fetus also feels the impact of these dangerous drugs. And if you are
addicted to cocaine -- also called coke, snow, or blow -- you're not only putting your own life on
the line, but you are risking the health of your unborn baby. The consequences of using cocaine
include heart attacks, respiratory failure, strokes, and seizures. And these life-threatening health
problems can also be passed to an unborn baby. Taking drugs during pregnancy also increases the
chance of birth defects, premature babies, underweight babies, and stillborn births. Exposure to
drugs such as marijuana -- also called weed, ganja, dope, or pot -- and alcohol before birth has
been proven to cause behavior problems in early childhood. These drugs can also affect the
child's memory and attentiveness. In addition, some findings show that babies born to women
who use cocaine, alcohol, or tobacco when they are pregnant may have brain structure changes
that persist into early adolescence.
While cocaine's effects are usually immediate, the effect it can have on a fetus may last a
lifetime. Babies born to mothers who smoke crack cocaine during pregnancy -- so-called ''crack
babies'' -- usually have their own set of physical and mental problems. According to the National
Institute on Drug Abuse, exposure to cocaine in the womb can lead to subtle, yet significant,
deficits later in children.
Cigarette Smoking
Smoking during pregnancy affects you and your babys before, during, and after your baby is
born. The nicotine (the addictive substance in cigarettes), carbon monoxide, and numerous other
poisons you inhale from a cigarette are carried through your bloodstream and go directly to your
baby. Smoking while pregnant will:
Lower the amount of oxygen available to you and your growing baby.
Increase your baby's heart rate.
Increase the chances of miscarriage and stillbirth.
Increase the risk that your baby is born prematurely and/or born with low birth weight.
Increase your baby's risk of developing respiratory (lung) problems.
Increases risks of birth defects.
Increases risk of Sudden Infant Death Syndrome.
The more cigarettes you smoke per day, the greater your baby's chances of developing these and
other health problems. There is no "safe" level of smoking while pregnant.
Carbon monoxide combines with haemoglobin (Hb) in the fetus red blood cells. If the Hb is
combined with carbon monoxide then it cannot combine with oxygen. So when a mother
smokes, she reduces the amount of oxygen being carried in her own bloods and also the babys
blood.
Nicotine reduces the diameter of the foetus blood vessels. This reduces the volume of blood that
can flow through them. This, too, reduces the amount of oxygen reaching the foetus developing
tissues. Nicotine also appears to affect the development of the nervous system.
Birth Control
Birth control methods include hormonal contraceptives, such as pills, shots and patches. Each
method and brand has a unique mixture of estrogen and progestin and delivery molecules that
can potentially affect a fetus. In most cases, taking birth control during the first four to eight
weeks of a pregnancy will have no ill side-effects on a fetus. Regardless of any potential risk
factors or lack thereof, stop taking birth control and consult a physician if pregnancy is likely.
The possibility of birth defects concerns many women who become pregnant while taking birth
control pills. However, there is no scientific evidence that taking birth control pills during early
pregnancy affects the rate of birth defects. The risk of miscarriage due to birth control is
possible; however, no statistical data in humans has been compiled Birth control affects the
amount of estrogen and progestin in the body in order to regulate the menstrual cycle... For
instance, Drugs.com reports that Yasmin has been placed in category X due to the fact that
animal studies have shown that some of the chemicals in Yasmin have produced miscarriages.
None of the statistics have been verified in humans.
Human Reproductive Anatomy and Physiology- Contraceptives
Effective public health programs, research, and policy relating to human sexuality, pregnancy,
contraception, and the transmission of sexually transmitted infections (including HIV) depends
upon knowledge of the structure(anatomy) and function (physiology) of the male and female
reproductive systems. Human beings are sexual throughout life. Sexuality encompasses more
than sexual behavior - it is not only the physical, but the mental and spiritual as well. Sexuality
is a core component of personality and a fundamental part of human life. While the problems
usually associated with sexual behavior are real and need to be addressed, human sexuality also
has significant meaning and value in each individual's life.
Sixty-one percent of all women worldwide who are within the reproductive age (15-44 years
old), are using methods of contraception (methods used to deliberately prevent pregnancy). No
method of contraception is 100% effective other than complete abstinence from sexual
intercourse. However, many methods exist that are close to 100% effective if used consistently
and correctly. People frequently fail to use their method every time or to use it perfectly. Thus,
even people using a method may face an unintended pregnancy. Factors contributing to
unintended pregnancy are complex, and may involve the interplay of emotional, psychosocial,
political, religious, cultural, and economic forces. Contraceptive effectiveness rates are estimates
of the probability that a pregnancy will occur during the first year of method use. Perfect use
refers to the effectiveness of a method when it is used consistently and correctly. Typical use
refers to the effectiveness of a method for the average person who does not always use the
method correctly and consistently. Birth control is a regimen of one or more actions, devices, or
medications followed in order to deliberately prevent or reduce the likelihood of a woman
becoming pregnant. Methods and intentions typically termed birth control may be considered a
pivotal ingredient to family planning. Mechanisms which are intended to reduce the likelihood of
the fertilization of an ovum by a sperm may more specifically be referred to as contraception.
Contraception differs from abortion in that the former prevents fertilization, while the latter
terminates an already established pregnancy. Methods of birth control (e.g. the pill, IUDs,
implants, patches, injections, vaginal ring and some others) which may prevent the implantation
of an embryo if fertilization occurs are medically considered to be contraception.
Type
Abstinence
Procedure
Refrain from sexual
Method
Effectiveness
Risks
No sperm in vagina
100%
None
70-80%
None
70-80%
None
intercourse
Rhythm
Intercourse is
fertilization is only
Method
avoided for about an
possible during 8-day
8-day span every
span in middle of
month in middle of
menstrual cycle
her cycle, from about
five days before
ovulation to three
days after ovulation.
Withdrawal
The man withdraws
sperm are unable to
his penis from the
enter vagina if male
vagina at just the
penis is removed at
right moment before
the right time
ejaculation.
Tubal Ligation
Oviducts are cut and
(Vasectomy)
tied
Hormonal IUD
Flexible, plastic coil
Releases small
(intrauterine
inserted by physician
amounts of estrogen.
infections,
In most cases, stops
uterine
egg from developing
perforation
device)
No eggs in oviduct
Almost 99%
About 75%
Irreversible
About 99%
May cause
and being released,
but can also operate
by killing a fertilized
egg by preventing its
implantation
Oral
Hormone medication
Stops release of FSH
More than
Blood clots,
Contraceptive
taken daily
and LH, but can also
90%
especially in
operate by killing a
smokers
fertilized egg by
preventing its
implantation
Contraceptive
Tubes of
Stops release of FSH
More than
Implants
progesterone
and LH, but can also
90%
implanted under the
operate by killing a
skin
fertilized egg by
None known
preventing its
implantation
Contraceptive
Injections of
Stops release of FSH
Injections
hormones
and LH, but can also
About 99%
Possible
osteoporosis
operate by killing a
fertilized egg by
preventing its
implantation
Diaphragm
Latex cup inserted
Blocks entrance of
With
Latex or
into vagina to cover
sperm into uterus
spermicide,
spermicide
cervix before
about 90%
allergy
Almost 85%
UTI, latex or
intercourse
Cervical Cap
Latex cup held by
Delivers spermicide
suction over cervix
near cervix
spermicide
allergy
Female
Polyurethane liner
Blocks entrance of
Condom
fitted inside vagina
sperm into uterus and
Almost 85%
None
90%
None
About 75%
UTI, allergy to
prevents STDs
Male Condom
soft sheath, made of
Blocks entrance of
latex or animal
sperm into vagina
membrane, encloses
and prevents STD's
penis, trapping
ejaculated sperm
Jellies, Cream,
Spermicidal products
Kills large number of
Foams
inserted before
sperm
spermicides
intercourse
Natural Family
Keep record of
Avoid sexual
Planning
ovulation using
intercourse near
various methods
ovulation
Vagina cleansed
Douche
About 70%
None known
Washes out sperm
Less than 70%
None known
Pill taken after
Prevents release of
About 89%
Same as oral
intercourse
egg, fertilization of
after intercourse
Plan B Pill
egg, but can also
operate by killing a
fertilized egg by
preventing its
implantation
contraceptive
Different types of
Contraceptive
methods
