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

Sticky sweet method-endodontics principles, Sticky sweet method Richwi...

Sticky sweet method Richwil crown and bridge remover -It is a resin block of water-soluble , like a stick sweet -It is first softened in hot water -Placed on the restorat

Functions of pantothenic and biotin acid for the body, Q. What are the func...

Q. What are the functions of pantothenic and biotin acid for the body? How are these vitamins obtained? Biotin also known as vitamin B8 is a vitamin that acts in the metabolism

Fats and lipids, Composed of C, H and O (fewer polar OH bonds than carbohyd...

Composed of C, H and O (fewer polar OH bonds than carbohydrates) Can be used at energy storage, components of cell membranes, chemical signals & thermal insulation Are

Define the term - clinical neuropsychology, Clinical Neuropsychology Cl...

Clinical Neuropsychology Clinical neuropsychology is the application of neuropsychological knowledge to the assessment, management and rehabilitation of people who have suffere

Classes of life form, Classes of Life Form The five life form classes ...

Classes of Life Form The five life form classes are: Phanerophytes, Chamaephytes, Hemicryptophytes, Cryptophytes, and Therophytes.

Benefit of hypothermic, Normal 0 false false false EN-I...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Describe components of a complete diagnosis, Describe Components of a Compl...

Describe Components of a Complete Diagnosis of Congenital Heart Disease ? A complete diagnosis of congenital heart disease requires accurate and thorough description of the he

Explain oxygen therapyin respiratory support, Explain Oxygen Therapyin resp...

Explain Oxygen Therapyin respiratory support? Oxygen is given to correct hypoxemia. An initial high concentration of oxygen (FiO2) is given while the underlying cause is identi

What is biological magnification, a) What is biological magnification? ...

a) What is biological magnification? b) Describe how DDT as a water pollutant undergoes biological magnification?

How do genetic mutations influence biological diversity, How do genetic mut...

How do genetic mutations influence biological diversity? Too frequent or too extensive genetic mutations usually are deleterious for individuals and species. These mutations fr

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