Pre-embryo - human development, Biology

Assignment Help:

Pre-Embryo - Human Development

About thirty hours after fertilization the zygote goes through mitosis giving rise to 2 blastomeres. These blastomeres go through further cleavages and by the 3rd day after fertilization, the tiny mass of cells reaches the uterus. Through this time it is a solid ball of cells called morula. In the next three days the morula is changed into a hollow ball of cells called blastocyst. The cavity of blastocyst is filled along with fluid secreted by the cells. One portion of the blastocyst consists of a concentrated mass of cells that will give rise to the entire body of the new individual. This is termed as the inner cell mass (ICM). Interestingly, each cell of this mass has the capability to develop into a complete individual. Identical twins are formed if the ICM splits. The outer ring of cells of the blastocyst surrounding its cavity is termed as trophoblast and gives rise to all the extra-embryonic membranes including much more of the placenta. This stage of development is important as the cells begin to move for the first time and become rearranged to shape the new individual. This procedure you might recall is the beginning of morphogenesis. However the major morphogenetic events occur during the third to eighth week.


Related Discussions:- Pre-embryo - human development

What is the plasma membrane of the cell, The plasma membrane is the outer m...

The plasma membrane is the outer membrane of the cell it delimits the cell itself and a cell interior with particular conditions for the cellular function. As it is selectively per

Evidence in favour and against of mutation theory, EVIDENC E IN FAVOUR OF ...

EVIDENC E IN FAVOUR OF THE MUTATION THOERY - Mutation theory can explain both progressive and retrogressive evolution and the occurrence of both changed and unchanged forms.

Composition-atmosphere, Composition The present day composition of atmo...

Composition The present day composition of atmosphere is the product of a lengthy evolutionary process that began more than four billion years ago. It is composed of a mixture

Reproduction, briefly deccribe the eggs snd follicles

briefly deccribe the eggs snd follicles

Physical element with great amount of energy at earth origin, Which physica...

Which physical elements contributed to the great amount of available energy on the primitive earth at the time of the origin of life? 3.5 billion years since the water cycle wa

Dietary management of dyspepsia, Q. Dietary management of dyspepsia? Ke...

Q. Dietary management of dyspepsia? Keeping in mind the etiology, symptoms and complications of dyspepsia it must be clear that treatment and management of [his disorder does n

Which mechanism is significant in death of erythrocytes, Of the following, ...

Of the following, which mechanisms are significant in the death of erythrocytes (pron: eh-rith-reh-sites) in human blood? Is it a) Phagocytosis (pron: fag-eh-seh-toe-sis) b)

Water soluble vitamins, Water Soluble Vitamins B-vitamins are abundant...

Water Soluble Vitamins B-vitamins are abundant in milk and other feeds. B-vitamins are synthesized by rumen microorganisms, beginning soon after a young animal begins feeding.

Non-consumptive value, This is concerned more with nature's services which ...

This is concerned more with nature's services which also make vital contributions to the welfare of society and to ecological processes without which our planet would be uninhabita

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