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The four most common teratogens are tobacco, alcohol, medications and illegal drugs. Teratogens are substances that could harm a developing fetus by affecting growth and causing birth defects or death. The use of tobacco during pregnancy is dangerous because the smoke causes the blood vessels to constrict.


the teratogen, if it is to have any effect, will be so profound as to cause a spontaneous abortion. Some examples of teratogens known to cause human confirmation are listed in the table below. A few of the most common examples will be discussed below.


A teratogen is any agent that causes an abnormality following fetal exposure during pregnancy. Teratogens are usually discovered after an increased prevalence of a particular birth defect. For example, in the early 1960’s, a drug known as thalidomide was used to treat morning sickness. Exposure of the fetus during this early stage of development resulted in cases of phocomelia, a congenital ...


What are the most sensitive periods for teratogens in pregnancy? Once the egg is fertilized (conception), it takes about six to nine days for implantation (anchoring into the uterus) to occur. Once the fertilized egg is connected to the uterus, a common blood supply exists between the mother and the embryo.


Common Teratogens. and Their Effects What is a teratogen? l Is any factor, chemical or physical, that adversely affects the fertilized ovum, embryo or fetus. l Is any agent that can induce or increase the incidence of a congenital malformation. What is teratology? l is the study of abnormal development in embryos and the causes of congenital malformations or birth defects Effects of teratogens ...


Teratogens are drugs, chemicals, or even infections that can cause abnormal fetal development. There are billions of potential teratogens, but only a few agents are proven to have teratogenic effects.


Some teratogens are benign until they build to "threshold concentration" levels in the mother and then their effects are seen. Some teratogens are dangerous throughout a pregnancy and some are dangerous only at specific points of embryonic development. The only safe course of action is to actively avoid known teratogens before and during pregnancy.


Teratogens are substances that can cause harm in a developing fetus resulting in birth defects or fetal death. Teratogens affect growth and development of the baby. The effect of the teratogen depends on the specific substance and how much exposure has occurred. Common teratogens include alcohol, tobacco, illegal drugs and medications.




Identifying teratogens What studies are conducted to determine whether an agent is a teratogen? The following studies may be conducted to determine whether or not an agent is a teratogen: Animal studies - Animal studies are the primary study method to determine whether a medication, or other environmental exposure, is safe during human ...