Second stage of invagination, Biology

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.

Posted Date: 1/25/2013 5:03:57 AM | Location : United States







Related Discussions:- Second stage of invagination, Assignment Help, Ask Question on Second stage of invagination, Get Answer, Expert's Help, Second stage of invagination Discussions

Write discussion on Second stage of invagination
Your posts are moderated
Related Questions
Each of the three NADH molecules formed per turn of the cycle yields 3 ATPs and the one FADH2 yields 2 ATPs by oxidative phosphorylation (whereas some measurements indicate in whic

What are cnidocytes? What is the name of the capsule inside the cnidocyte? What are the biological functions of this structure? Cnidocytes are specialized cells present in coel

Why does bark often die and break naturally? The bark is the mature periderm of the stem, branches and roots. It dies and breaks when these structures grow and thus the perider

Q. What are clotting factors? Clotting factors are substances (coenzymes, enzymes, reagents) necessary for the clotting stages to happen. Besides those triggering reagents and

What is difficult breathing? Difficult Breathing: Tachypnea (respiratory rates consistently more than 451 min), is a characteristic manifestation of heart failure in newborns (

FLUORIDE It is mostly available in drinking water. Fluoride is essential for the formation of enamel of the teeth. Deficiency of fluoride causes weakness of enamel.

Diagram and describe the signalling of toll like receptors and the resulting cytokines.

Q. Technical Requirements for pulmonary angiography? Digital subtraction pulmonary angiography with selective pulmonary arterial injections is vastly superior to conventional c

Assessment You can observe it visually at birth. The anterior abdominal wall is absent and the posterior bladder lining which is bright red in colour is exposed. Urine seeps

Q. Give some Chlorine-releasing compound? Of all the chlorine - releasing compounds, hypochlorites have been the choice disinfectants used in food industry. The hypoc