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

Solution of ampicillin, How much ampicillin (sodium sal, mw=371.40) would y...

How much ampicillin (sodium sal, mw=371.40) would you dissolve in 400 mL of water to make 80 mg/ml solution of ampicillin?

What is resective therapy, Resective therapy Is used to reduce pockets,...

Resective therapy Is used to reduce pockets, correct negative osseous architecture and rough implant surfaces and increase the area of keratinized gingival if needed. Apical

Human diseases caused by bacteria, Q. What are some human diseases caused b...

Q. What are some human diseases caused by bacteria and what are their respective modes of transmission? The major human bacterial infections transmitted by respiratory secretio

What are the problems that vertebrates required, What are the problems that...

What are the problems that vertebrates required to solve to adapt to the terrestrial environment as they came from the aquatic habitat? How evolution does solve those problems?

Is the epithelium vascularized, Is the epithelium vascularized? How do nutr...

Is the epithelium vascularized? How do nutrients and oxygen reach the epithelium? Why is this feature a significant evolutionary acquisition? Epithelia are not vascularized (ca

What are transcription process and the replication processes, Q What are th...

Q What are the differences and similarities between the transcription process and the replication processes? A DNA polynucleotide chain serves up as a template in the replication (

Explain about the term- therapeutic, Explain about the term- Therapeutic ...

Explain about the term- Therapeutic Therapeutic approaches that scientists are pursuing include transplanting cells to replace those which are damaged or using growth factors

Concentration Gradients and Membrane Permeability, 3. Which substance(s) cr...

3. Which substance(s) crossed the dialysis membrane? Support your response with data-based evidence.

Ornithosis (psittacosis), Or nit h o s i s (psittacosis) This is ...

Or nit h o s i s (psittacosis) This is an important zoonotic bacterial infection and causes disease in humans and birds. Collectively, these conditions are called as chla

What are the three main arthropod classes constituted, How are the excretor...

How are the excretory systems of the three main arthropod classes constituted? In crustaceans a pair of excretory organs known as green glands exists. The green glands collect

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