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

Nomenclature, who proposed the trinominal nomenclature

who proposed the trinominal nomenclature

Explain the following terms in detail - homology, Explain the following ter...

Explain the following terms in detail - Homology, Homologous ? Structures that have a similar evolutionary origin however different functions. The wing of a bat and a whale's fl

Determine the name of material used for bcc, Determine the name of Material...

Determine the name of Material used for BCC You must be interested to know about type of material you can prepare and some material is available in hospitals and clinics for us

Explain lock and key model, Fischer 's template or lock and key model ...

Fischer 's template or lock and key model According to this model, the catalytic site of the enzyme has a proper conformation compatible to a specific substrate even  in  the a

St depression only on recovery, Q. ST Depression only on Recovery? Alth...

Q. ST Depression only on Recovery? Although ST depression during exercise often persists into recovery, it may not manifest until exercise has been terminated. The reasons for

Describe about mixed type of ta pvc, Describe about Mixed Type of TA PVC ? ...

Describe about Mixed Type of TA PVC ? Management depends upon the type of TAPVC and could be very challenging. However the basic principle is to get all the pulmonary veins to

What are the products and reagents of fermentation, Q. In general what are ...

Q. In general what are the products and reagents of fermentation? In fermentation glucose sugar is degraded into pyruvic acid each glucose molecule forms two pyruvic acid molec

The salt concentration is higher than that of acid, Which of the following ...

Which of the following statements about buffers is true? Select one: a. A buffer composed of a weak acid of pKa = 5 is stronger at pH 4 than at pH 6. b. At pH values lower

Explain stavudine, Explain Stavudine It can be given either in initial ...

Explain Stavudine It can be given either in initial combination therapy or after failure of regimens containing other NRTIs. Cross-resistance with zidovudine is frequent, ho

Determine the emerging clinical use of brain, Determine the Emerging clinic...

Determine the Emerging clinical use of brain Emerging clinical uses include identifying brain regions from which epileptic seizures emanate and confirming diagnoses of neurodeg

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