Teratogens. A teratogen is any environmental substance or agent—biological, chemical, or physical—that can have a detrimental effect on a developing fetus. Exposure to teratogens during the prenatal stage can significantly raise the risk of birth defects.
What environmental factors can affect a developing fetus?
Environmental factors which have been implicated in adverse pregnancy outcome include smoking, video display terminals, anesthetic gases, antineoplastic drugs and exposure to lead, selenium and inorganic mercury.
What are the environmental conditions that influence development called?
Over the past 100 years, the study of environmental influences on human physical growth and development has focused on the influences of social and economic factors; family and household characteristics; urbanization/modernization; nutrition; and features of the physical environment such as altitude, temperature and …
What are the other factors that affect the embryo and fetus?
Factors affecting fetal growth can be maternal, placental, or fetal. Maternal factors include maternal size, weight, weight for height, nutritional state, anemia, high environmental noise exposure, cigarette smoking, substance abuse, or uterine blood flow.
What factors can affect embryonic development?
Genetic potential of both parents, plane of nutrition of the mother, environmental temperature, size of the mother, toxicants, number of litter-mates, and uterine space are among the many factors that can have an affect on the fetus.
Why is the embryo so susceptible to environmental influences?
During prenatal development, environmental factors can significantly affect the development of the child. Most everything the mother ingests, including food, liquid, and even medication, travels through the placenta to the fetus; anything the mother is exposed to in the environment affects the fetus.
What are environmental factors that may cause malformations in the developing embryo give specific information from your research?
An environmental cause can include drugs, alcohol, or a disease the mother has that can increase the chance for the baby to be born with a birth defect. An agent that can cause a birth defect is known as a teratogen. Multifactorial birth defects are caused by a combination of genes and environmental exposures.
What are the factors that influence growth and development?
10 Factors That Influence the Growth and Development of a Child
- Heredity. Heredity is the transmission of physical characteristics from parents to children through their genes. …
- Environment. …
- Sex. …
- Exercise and Health. …
- Hormones. …
- Nutrition. …
- Familial Influence. …
- Geographical Influences.
What environmental factors influenced the evolution of early life forms?
Competition for space, food, and shelter as well as increased predation created additional natural-selection pressures. Fossil records indicate mass extinctions and a major change in genetic diversity at this time.
What are the five factors that influence growth and development?
Five main factors identified in contributing to growth and developments at early childhood are nutrition, parent’s behaviours, parenting, social and cultural practices, and environment.
How can get pregnant?
Follow these simple tips for how to get pregnant:
- Have sex regularly. The highest pregnancy rates occur in couples who have sex every day or every other day.
- Have sex near the time of ovulation. …
- Maintain a normal weight.
What are the factors that can affect the development of a child before birth?
Prenatal risk factors include chronic maternal illness, certain maternal infections, toxin exposures and nutritional deficiencies. Risk factors in the perinatal period include pregnancy-related complications, prematurity and low birth weight, and infection exposure during pregnancy or at time of birth.
What causes miscarriage?
Most miscarriages occur because the fetus isn’t developing as expected. About 50 percent of miscarriages are associated with extra or missing chromosomes. Most often, chromosome problems result from errors that occur by chance as the embryo divides and grows — not problems inherited from the parents.
What is the embryo?
An embryo is the early stage of human development in which organs are critical body structures are formed. An embryo is termed a fetus beginning in the 11th week of pregnancy, which is the 9th week of development after fertilization of the egg. A zygote is a single-celled organism resulting from a fertilized egg.
How many main factors are there in environment?
Environmental factors include temperature, food, pollutants, population density, sound, light, and parasites.
What happens during the embryonic stage?
The embryonic stage plays an important role in the development of the brain. Approximately four weeks after conception, the neural tube forms. This tube will later develop into the central nervous system including the spinal cord and brain. The neural tube begins to form along with an area known as the neural plate.