chapter 1 and chapter 4 Flashcards
composed of elongated cells specialized in contraction and movement
muscular tissues
composed long fine processes specialized in receiving generating and transmitting nerve impulses
nervous tissues
defined by the production of the very abundant ECM
connective tissues
function of the epithelial tissues
lining( covering)
secretion
absorption
special epithelial tissues that can contract (myoepithelial cells)
special sensory tissues ( taste buds and olfactory tissues)
closely aggregated polyhedrla cells
epithelial tissues
the cells are divided into two groups………
parenchyma and stroma
what does the brain and spinal cord consist of
stroma which is always connective tissues
the amount of ECM in each type of tissues
epithelial: small amount
connective: huge amount
nervous: too small
muscular: moderate amount
the morphologies of epithelial cells
squamous, columnar, cuboidal
to whom is the nuclei corresponding in regards to its shape
to the shape of the cell
what dictates the function of the cell
its size and morphology
shapes of the nuclei in respond to the shape of the cell
squamous—-> flattened
columnar—> elongated
cuboidal—–> spherical
the importance of the nuclei shape
gives access to differentiate between cells shape specially when the lipid rich membrane can not be distinguished using the light microscopy
allows the ability to classify the epithelial cells in regard to it shape and # of layers
is the epithelial cell avascular
yes
where does it get its nutrients
the connective tissues which provides the blood vessels
does the epithelial cell has innervation
yes
what is the lamina propria
the connective tissues beneath the epithelial tissues in the urinary, digestive and respiratory system
what is the papillae
the bends( evagination) between the connective and the epithelium
what is the red lining underneath the epithelial cells in the light microscopy and staining
the basement membrane
what is the basement membrane made of
basal lamia
reticular lamina
thin electron dense sheet like layer of
fine fibrils
produced by the epithelial
basal lamina
diffuse and fibrous
produced by the connective
reticular lamina
from where do the macromolecules of the basal lamina come from
the basal surface of the epithelial cells
ECM components in the basal lamina
collagen IV : 2D structure( further from the basal surface the lowest)
laminin: bind with the transmembrane integrin proteins in the basal cell membrane ( through the mesh formed by the collagen IV )
nidogen+ perlecan:
short rod like protein+ proteoglycan
the components of the reticular lamina
collagen III bound to the basal lamina by collagen VII
both produced in the connective tissue
external lamina
similar to the basal lamina
however it surround the muscle cells, nerve and fat storing cells
which part behaves as a scaffold for faster regeneration and repair in the epithelial cells
basement membrane
type of junction
*both name for each type
tight junction zonula occluden adjacent junction zonula adheren desmosomes macula adherens hemidesmosomes gap junctions nexus focal adhesion
