EXAM 3 Flashcards
(16 cards)
tight junction
seals neighboring cells together in an epithelelial sheet to rpevent leakage molecules between them
adherens junctions
joins an actin bunding in one cell to a similar bundle in a neighboring cell
desmosomes
joins the intermediate filaments in one cell to those in a neighbor
gap junction
forms channels that allow small water-soluble molecules including ions to pass from cell to cell
hemidesmosome
anchors intermediate filaments in a cell to the basal lamina
cell-to-cell junctions
mediate cell adhesiveness and contribute to morphogenesis
When does zygotic genome transcription start?
during the mid-blastula transition
Gastrulation
cells will move, rearrange, and some will migrate from one position to another
-takes us from a hollow blastula to a multi layered embryo with distinct germ layers
Germ layers
cell populations with distinct fates
ectoderm
epidermis, nervous system
mesoderm
muscle, blood, bone, etc.
endoderm
gut
Fate map
a map of future cell fates in an organism
What drives the first events of gastrulation
changes in cell-cell and cell-matrix adhesion
EMT
epithelial to mesenchyme transition
Ingression
Primary mesenchyme will detach from fellow epithelial cells and extracellular ECM (hyaline) layer
