During gastrulation in amphibians,the presumptive mesoderm moves into the interior of the embryo by following fibrils of fibronectin.Given what you know about gastrulation,you predict that the fibronectin is most likely secreted by which cells?
A)endodermal cells on the exterior of the embryo
B)mesodermal cells that develop on the inside of the blastocyst
C)ectodermal cells that line the inside of the blastocoel
D)endodermal cells that migrate to the inside of the blastocoel

Question

Quizplus · Accepted Answer

During gastrulation, the ectodermal cells line the inside of the blastocoel and eventually form the roof of the archenteron. These cells secrete fibronectin, which helps guide the presumptive mesoderm cells into the interior of the embryo. Therefore, option C is the correct choice. The other options are not involved in the secretion of fibronectin during gastrulation.

During Gastrulation in Amphibians,the Presumptive Mesoderm Moves into the Interior