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

Nature of disease, Q. Nature of disease? Education is very important fo...

Q. Nature of disease? Education is very important for diabetics because it is a lifelong disorder. In order to enable the patient to lead a healthy and a good quality Life free

Find a chemically gated protein, You have identified a protein in a cell th...

You have identified a protein in a cell that you know that comes from the human body. With respect to that protein you have also determined that it allows sodium ions to go through

What factor below contributed to the current variations, According to the t...

According to the theory of natural selection, what factor below contributed to the current variations in beak sizes of finch species on the Galapagos islands? a. Finches dispersed

Nursing research, Definition: We  will  first define the term "Researc...

Definition: We  will  first define the term "Research" before  explaining the term Nursing Research. Research is a scientific process. It is defined as a systematic search for

What is expression of the dominant phenotype, If we make a cross of two phe...

If we make a cross of two phenotypically WT zebrafish, and we get the following results, what can we say about the genotype of those two WT looking parents from the following resul

Explain the skeletal system, Explain the Skeletal System? Skeletal Sys...

Explain the Skeletal System? Skeletal System: The support framework, or skeleton, in the human body is composed of mostly hard mineral substances. Unlike crustaceans or insec

Long term potentiation, It is a neural mechanism that plays a role in encod...

It is a neural mechanism that plays a role in encoding of new information. Encoding takes place as a result of changes in the strength of synapses among neurons in neuronal network

Explain the theory of law of minimum, Explain the theory of Law of Minimum ...

Explain the theory of Law of Minimum    This is one of the earliest hypotheses put forward by von Liebig on the relationship between the amount of plant  nutrient in the soil a

Menstrual cycle- reproduction, Menstrual Cycle- Reproduction Menstrual...

Menstrual Cycle- Reproduction Menstrual cycles are characteristic of primates and do not occur in other vertebrate groups. The length of the cycle is highly variable, though 2

Antimicrobial prophylaxis - number of doses, Timing and number of doses ...

Timing and number of doses It has been common practice to give antibiotics at the time of anesthesia induction, which results in adequate serum and tissue levels of the drugs;

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