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

What are examples of the ecological and economic, What are examples of the ...

What are examples of the ecological and economic importance of molluscs? Molluscs are significant players in several food chains in ecosystems. Many marine molluscs are part of

Demonstrate the counselling process in the form of role play, Q. Demonstrat...

Q. Demonstrate the counselling process in the form of role play? Role playing refers either to the unconscious changing of one's behavior to assume a social role or roles in lif

Explain about the cancer, Explain about the Cancer? The word 'cancer' c...

Explain about the Cancer? The word 'cancer' comes from the Latin for crab. It refers 90 any malignant growth or tumor caused by abnormal and uncontrolled cell division. Body ce

Define the term - hemiplegia, Define the term - Hemiplegia The characte...

Define the term - Hemiplegia The characteristics of hemiplegia (again, hemi means "half") are loss of voluntary movements on one side of the body, changes in postural tone, and

Genomic clone, Genomic clone is the piece of a DNA taken from genome of a ...

Genomic clone is the piece of a DNA taken from genome of a cell or an animal, and spliced into the bacteriophage or other kind of cloning vector. A genomic clone might contain cod

Explain some food applications of pectin, Explain Some food applications of...

Explain Some food applications of pectin As with other viscous polyanions such as carrageenan, pectin may be protective towards milk casein colloids, enhancing the properties (

Determine about the psychological tests, Determine about the Psychological ...

Determine about the Psychological tests The construct of attention has been found to comprise several interrelated elements that the paediatric neuropsychologist can consider i

Cytoplasmic matrix, Cytoplasmic Matrix ( = cytosol  or Hyaloplasm ) Thi...

Cytoplasmic Matrix ( = cytosol  or Hyaloplasm ) This is the actual protoplasmic  part of the cytoplasm, containing dissolved proteins, electrolytes, glucose, etc. And forming

Theskin, drawandlabelthemajorendocrineglandsofthehumanbody

drawandlabelthemajorendocrineglandsofthehumanbody

Symbolising and language skills, Language, a powerful tool for communicatio...

Language, a powerful tool for communication should have played a very important part in the evolutionary history of human species. Two relevant questions that could be asked of hum

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