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
Permissive Interaction - Pancreas Development Figure describes the development of pancreas in a mammal. In an organism like mouse the pancreas is first seen as a diverticulum

Wound breakdown With careful flap design and gentle tissue handling this is a rare complication. The healing which follows is by secondary intention and can be aided by chlorhe


Explain Bone Healing Process in Nutritional Care? Protein is essential for callus formation, calcification and bone healing especially in cases of orthopaedic surgery. The prot

Define the Basic Concepts behind the Spectral Techniques? Energy is transmitted via electromagnetic waves that are characterized by their frequency and wavelength. The physical

What is the Definition of Polyphenols? Polyphenols are the compounds that contain an-ON group attached to the benzene ring. The main classes are: flavonoids, phenolic acids and

At the beginning of the process in an animal cell, the partition of the centriole takes place, which has been duplicated during Interphase but were in the same centrosome. Bipol

Functions of Plasma Proteins The proteins of the plasma serve several important functions. They exert osmotic pressure varying from 25 to 30 mm Hg, which regulate

Human Impact on the Phosphorus Cycle Like other biogeochemical cycles, human activities have altered the phosphorus cycle. Human beings mine phosphate rocks and guano deposits

Match each of the methods or vectors below to an appropriate form of gene therapy, assigning two methods or vectors to each form. Use each method or vector only once. Methods/v