Human development, Biology

Assignment Help:

Human Development

Human development is a continuous procedure that begins when the ovum from a female is fertilised via sperm from a male to form the zygote. Growth and differentiation transform the zygote into a multicellular adult human being. Though, it is important to realise that development does not stop at birth. It is a continuous procedure. It is usual to divide human development into prenatal and postnatal periods. Prenatal period refers to the period before birth. Throughout this period for the first eight weeks the developing human being is called an embryo since the organ systems are forming. From the 9th week onwards the term foetus is used. The foetal period (9 weeks to birth) is charactrised by growth and elaboration of structures. The postnatal period starts at birth and ends at death. Important developmental changes in addition to growth take place after birth, for example, the development of teeth and the changes during puberty. The brain triples in weight among birth and 16 years of age. Though, most developmental changes are completed by the age of 25.

The 266 days among conception and birth are traditionally divided into about three month periods, each termed as a trimester. We deal with each trimester but more emphasis is given Lo the first trimester as more dramatic changes take place during this period. But before we discuss the development of the human embryo it is significant to recapitulate the process of gametogenesis and the general structure of the female reproductive tract as the entire prenatal period is spent inside the womb of mother.


Related Discussions:- Human development

Risk analysis - animal studies, Animal studies Most toxicological data ...

Animal studies Most toxicological data for risk assessment are derived from the animal studies and  it  is, therefore, essential that these studies be conducted following widel

Driving force - mineral nutrition, Driving Force - Mineral Nutrition ...

Driving Force - Mineral Nutrition Let us now find out what is the driving force involved in protein mediated transport. Many membrane transport proteins allow specific solute

Campylobacter infection, C ampylobacter infection C a mpylobacter ...

C ampylobacter infection C a mpylobacter jejuni is the commonest species found in poultry. These are delicate organisms that may not survive outside the host unless prot

What are some evolutionary advantages of animals, What are some evolutionar...

What are some evolutionary advantages of animals with complete digestive tube? The complete digestive tube permits animals to continuously feed themselves without waiting for r

What is the treatment of tuberculosis, What is the treatment of tuberculosi...

What is the treatment of tuberculosis The disease can be very effectively treated with the help of antibiotic therapy, rest and nourishing food. The key to the treatment is ear

Energy input in ecosystem, Energy Input in Ecosystem Survival and func...

Energy Input in Ecosystem Survival and functioning of ecosystem is dependent on the input of energy. Continuous availability of energy is essential for supporting diverse ecos

What electrocardiogram results show a shortened qt interval, Electrocardiog...

Electrocardiogram results show a shortened QT interval and an increase in the P-R interval (i.e., decreased duration of action potential and decreased conduction velocity). Laborat

Differentiate between sterilization and disinfection, Q. Differentiate betw...

Q. Differentiate between sterilization and disinfection? 1) Sterilization is defined as freeing the object or substance from all life of any kind. It is the process by which a

What do you mean by sex ratio, What do you mean by sex ratio? Sex Rati...

What do you mean by sex ratio? Sex Ratio is defined as "the number of females per 1000 males". Sex ratio is an important social indicator to measure the extent of prevailing e

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd