Second stage of invagination, Biology

Assignment Help:

Second Stage of Invagination

The 2nd stage of invagination starts with release of secondary mesenchyme from the tip of archenteron into the blastocoel. The cells of secondary mesenchyme stay in which they are released at the tip of archenteron but their filopodia extend up to and attach to the inner side of the wall of blastocoel opposite to blastopore. Contractions of these ' filopodia pull the archenteron in the direction of the animal pole causing further invagination of the endoderm. Finally, the archenteron bends and its tip fuse along with the blastocoel wall on the ventral side where the mouth opens later. The secondary mesenchyme then disperses in the blastocoel and gives increment to mesodermal organs.


Related Discussions:- Second stage of invagination

Explain about dietary management, Q. Explain about Dietary Management? ...

Q. Explain about Dietary Management? Treatment for gout often include a diet of lower purine intake. Indeed, about one third of the body's uric acid can be attributed to diet.

Definition of a neuropsychological test, Definition of a neuropsychological...

Definition of a neuropsychological test The best definition of a neuropsychological test has been offered by Ralph Reitan, who described it as a test that is sensitive to the

Explain the nerve centres which control the body temperature, The nerve cen...

The nerve centres which control the body temperature and the urge for eating recontained in: 1.  Hypothalamus 2. Pons 3. Cerebellum 4. Thalamus Hypothalamus is the

Define mechanisms for antinutritional effect on human, Define mechanisms fo...

Define mechanisms for antinutritional effect on Human? There are several possibilities: reduced availability of amino acids to cancer cells by reversing the carcinogen-induced

To study if bacteria grow better where it is warm or cold, To study if bact...

To study if bacteria grow better where it is warm or cold Again inoculate two sterile dishes. Label one 'warm'  and the other 'cold'. Place the 1st dish in a dark warm place an

Define hormonal responses to injury, Define Hormonal Responses to Injury? ...

Define Hormonal Responses to Injury?  A number of hormonal changes take place in patients following injury. There is a marked rise in the counter regulatory hormones, viz., glu

Protozoa, what are characteristics of flagellata class ?

what are characteristics of flagellata class ?

Determine the types of emulsions, Determine the types of Emulsions? A f...

Determine the types of Emulsions? A food emulsion is basically a two phase system consisting of a liquid, such as oil, wax or essential oil and water. An emulsion has 3 parts -

Constituents of food – the major nutrients, Composition of Plant and Animal...

Composition of Plant and Animal Tissues Food supplies nutrients popularly known as major and minor nutrients based on the quantities in which they are required for the living b

Explain sympatric and allopatric speciation, Sympatric OR allopatric specia...

Sympatric OR allopatric speciation Sympatry The development of new species within a population. Two Hebe sp living in the same location but with different chromosomal numb

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