Defects in human development, Biology

Defects in Human Development

1) For instance, when a pregnant woman drinks alcohol her embryo is exposed to similar concentration of alcohol as is in her blood. The alcohol may generate a set of physical and mental abnormalities termed as foetal alcohol syndrome (FAS). In this syndrome prenatal and postnatal growth is retarded. Abnormal facial features, reduced head size and mental retardation are seen. As little as 8.5 ml of alcohol every day or engaging in a single drinking binge by a pregnant woman can result in FAS.

2) Infection through German measles (caused by Rubella virus) in a pregnant woman can cause congenital malformations in the embryo. If the rubella infection is contacted throughout the first four or five weeks of pregnancy, the embryo's eyes, ears and heart may be malformed when exposure to this virus during later stages of development may result in defects in the central nervous system.

3) There are several drugs that are apparently harmless to adults but may be injurious to developing embryos. They are not toxins but teratogens like they lead to malformations in the embryo. Perhaps the most unfortunate example of the effect of teratogens is the drug thalidomide which was used as a tranquilizer. In a couple of years of its introduction over 8000 crippled children with no limbs were take birth in Europe and England.

4) The highest sensitivity to such type of a teratogenic agents is during 18-55 days after conception. The peak period being day 30. Pregnant women must, therefore, never use any drugs without the advice of their attending physicians.

Posted Date: 2/1/2013 5:17:37 AM | Location : United States







Related Discussions:- Defects in human development, Assignment Help, Ask Question on Defects in human development, Get Answer, Expert's Help, Defects in human development Discussions

Write discussion on Defects in human development
Your posts are moderated
Related Questions
What is scientific investigation?

Define about the Carbohydrates - nutritional biochemistry? Carbohydrates, you should observe by now, are made up of carbon, hydrogen and oxygen only with hydrogen and oxygen at

"In these autotrophs, sporophyte is the dominant generation. Gametophyte is also photosynthetic and not dependent on sporophyte for nutrition."  These autotrophs are:  a.  P

Differentiate between glycogenesis and glycogenolysis. The synthesis  of glycogen in liver and muscle  is  called glycogenesis.  The breakdown of glycogen in the liver (glycoge

Circulation: If central pulses (femoral  in infants and  carotid in  children) are not  palpable, begin chest compression without losing any time.  In  young infants, encircle

Signify the term - Proglottids? Serially repeating segment like structures found in tapeworms which contain reproductive organs. Immature proglottids are continually added at t

general features of protochordates

In holly, serrated leaves are dominant to smooth-edged leaves, and red berries are dominant to green berries. Two holly plants heterozygous for leaf edge shape and berry color are

What is Kingdom Monera? The eubacteria, archaebacteria, and blue-green bacteria (or cyanobacteria) which form Kingdom Monera lack the cellular organization that all other livin

what is plasmalemma?