Cell Modification Flashcards
3 Types of Cell Modification
Apical Modification
Lateral Modification
Basal Modification
Highest point or top of a shape or object (apex)
Apical
TYPE of cell modification that is found on the apical surface of the cell
Apical Modification
Villi, cilia, flagella, root hairs
Apical Modification
also called as a brush or striated border
villi
finger-like cytoplasmic extension
villi
arises from the cell’s surface
villi
increases surface area allowing faster and more efficient absorption
villi
regularly arranged in epithelia
villi
present in small intestine
villi
provides a short distance for the diffusion of food molecules in the blood
villi
each villus has a ?
lacteal
lymphatic capillary that absorbs dietary fats in the villi of the small intestine
lacteal
smaller villi
microvilli
elongated, motile structures on the surface of some epithelial cells
cilia
short hair-like projections
cilia
made up of microtubules
cilia
connected to a basal body and extends from the free surface
cilia
exhibits rapid back-and-forth movement
cilia
found in the respiratory tract
cilia
tail-like projections that protrude from the cell body
flagella
bundle of nine pairs of microtubules surrounding two central microtubules
flagella
same axial structure with cilia but much longer
flagella
present in the tail of spermatozoa
flagella
long tubular-shaped outgrowths from root epidermal cells
root hairs
aids in plant nutrient acquisition, anchorage, and microbe interaction
root hairs
increases the root’s surface area
root hairs
of, at, toward, or from the side/s
lateral
TYPE of cell modification that is found on the basal surface of the cell
basal modification
tight junction, adherens junction, gap junction
lateral modification
intercellular adhesion complexes in epithelia and endothelia
tight junction
controls paralcellular permeability
tight junction
from the border between the apical and basolateral cell surface domains
tight junction
established and maintains cell polarity by restricting the distribution of lipids within the membrane
tight junction
establishes a barrier that prevents extracellular fluid across a layer of epithelial cells
tight junction
regulates the passage of ions, water, and macromolecules through the regions between cells (paracellular space)
tight junction
element of the cell-to-cell junction
adherens junction
has cadherin receptors that bridge the neighboring plasma membranes via their homophilic interactions
adherens junction
preserves tissue integrity by linking cells and connecting to actin filaments
adherens junction
maintains the physical association between cells
adherens junction
associates with cytoplasmic proteins which turn bind to cytoskeleton components
cadherin
cytoplasmic proteins
catenins
anchoring junction on the lateral surface of the cell
adherens junction
very similar to the anchoring junction of the basal surface of the cell
adherens junction
fastens cells to one another
adherens junction
interacts with other proteins including signaling molecules that renders AJs into highly dynamic and regulatable structures
cadherins
intercellular channels that allow ions, tiny molecules, and electrical impulses to be exchanged directly between nearby cells
gap junctions
communicating junctions
gap junctions
closable channels that connect the cytoplasm of adjoining animal cells
gap junctions
has the presence of connexon
gap junctions
allows direct exchange of chemicals between the cytoplasm of two cells
connexon
forming or belonging to a bottom layer (base)
basal
found on the basal surface of the cell
basal modification
desmosomes and basal infoldings
basal modification
specializes cell-to-cell junctions which provide mechanical strength to mechanically stressed tissues
desmosomes
mechanically stressed tissues
skin & heart muscle
anchoring junction on the basal surface of the cell
desmosomes
composed of keratin, integrins, and cadherins
desmosomes
rivet-like links between cytoskeleton and extracellular matrix components
desmosomes
extracellular matrix components
basal lamina (underlies epithelia)
supports the epithelium
basal infoldings
passive molecular sieve or ultrafilter
basal infoldings
present in mitochondria
basal infoldings
shows infoldings and invaginations dividing the base of the cell into many compartments parallel to each other
basal infoldings
contains mitochondria to give energy for active transport of ions
basal infoldings
increases the lateral surface area and functional capacity of that surface
basal infoldings
impermeable junctions
tight junctions
lining of the digestive tract
tight junctions
? binds to adjacent cells
anchoring junctions
adjacent cells
velcro
form internal tension-reducing network of fibers
desmosomes
plaques on surface of membrane attached to protein filaments
desmosomes
found in electrically excitable tissues to synchronize
gap junction
electrically excitable tissue
gap junction