Gastrulation

Question 1

Gastrulation

Answer 1

Formation of the 3 primary germ layers by major cell rearrangements

Question 2

3 Primary Germ Layers

Answer 2

1. Ectoderm: skin, nervous tissue
2. Mesoderm: circulatory, gonads, muscles
3. Endoderm: digestive tube

Question 3

Epithelial Cells

Answer 3

tightly connected to each other from sheets/tubes of cells

Question 4

Mesenchymal Cells

Answer 4

unconnected to each other and opperate as individual units

Question 5

Ingression (micromere descendents)

Answer 5

the migration of individual cells into the blastocoel by changes in call adhesion and motility

Question 6

Mesenchyme Blastula

Answer 6

PMCs will form the skeleton and skeletal tissues

Question 7

Archenteron Invagination

Answer 7

formation of the embryonic gut tube, bending of sheet cells

Question 8

Chodroitan Sulfate

Answer 8

aids invagination, by being secreted by vegetal cells

Question 9

Convergent-Extension

Answer 9

when cells intercalate to narrow a tissue

short/fat –> tall/slender

Question 10

Micromeres

Answer 10

turn into primary mesenchyme cells, form the skeleton and send out gut-making signals

Question 11

Vegetalized

Answer 11

mostly skeleton and guts

Question 12

Animalized

Answer 12

long cilia