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Chapter 19 ECM and junctions
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4 major families of tissues (tissue= group of similar cells)
1) epithelial tissues
2) connective tissues
3) muscular tissues
4) nervous tissue
4 major class Cell Junctions
CAOS
Channel-forming Junctions
Anchoring Junctions
Occluding Junctions
Signal-relaying Junctions
A
plasmodesmata
cell junction found in _____ cells and this is an example of a _____ junction
plant cells
only
chanel-forming junction
a Occluding Junction is a
A) desmosome
B) adherens junction
C) hemidesmosome
D) a and b
E) tight junction
E) tight junction
Occluding junctions include tight junctions and septate junctions
another name for a cell-matrix junction
actin-linked cell-matrix adhesions
The transmembrane adhesion proteins in anchoring junctions
CAMs (cell adhesion molecules)
The 2 major families of CAM's
Cadherins
Integrins
This anchoring protein connects IF's to ECM proteins to form
hemidesmosomes
integrins
this anchoring protein forms
desmosomes
cadherins
true/false
cadherins AND integrins are independant on Ca 2+ ions
True
False
false. Cadherins and integrins are dependant for funtionality on Ca2+ ions
__________ connects IF's of neighboring cells to provide mechanical strength. The protein involved is called_________
desmosomes
cadherin
A selectin is part of the _____ family. It also is dependant on ___
CAM
Ca2+ in order to function
The only CAM protein that does not require Ca2+ in order to function
Immunoglobin superfamily
Immunoglobulin superfamily examples:
A) neural cell adhesion molecule
B) intercellular cell adhesion molecule
C) desmosome
D) c and d
E) adherens junction
D) c and d
NCAM and ICAM
The blood-brain barrier is an example of this type of junction
tight junction
a ______ ______ is formed by a band of branching sealing strands that encircle the apical region of each cell
tight junction
sealing strands in a tight junction are composed of transmembrane proteins called
claudins
what is a Junctional complex
a complex of a combination of cell junctions in epithelial cells
3 examples of what might be found in a junctional complex and the proteins seen in that type of junction
tight junction (claudins)
adherens Junction (cadherins)
desmosomal junction (cadherins)
This type of junction permits the movement of ions and small molecules between cytosol of neighbouring cells
channel-forming junctions
a gap junction is found only in ____ cells and channels between cells are connected though ______
animal cells
connexons (formed of connexins)
T/F: Gap junctions link skeletal muscle and nervous tissue
F. Gap junction link the cells or nearly all mammalian tissues
EXCEPT
skeletal muscle and most nervous tissue
The
only
cells junctions in a plant cell are?
plasmodesmata
This specialized layer of ECM that helps bind cells to the ECM
basil lamina (basement membrane)
Not an example of ECM
A) fibronectin
B) perlecan
C) laminin
D) none of these
E) decorin
D) none of these
this type of CAM attaches a cells cytoskelton filaments to the basal lamina
integrins
define laminin.
ECM glycoprotein that helps attach the overlying cell to the underlying connective tissue
2 major families of molecules that are secreted by the cells in the matrix
GAGs
Fibrous proteins
GAGs - can be covelently linked to proteins to form _________
proteoglycans
ground substance is composed of?
proteoglycans and GAG's
an ECM family that consists of a repeating disaccharide repeated dozens of times
GAG
define: proteoglycan
a GAG that is linked to a core protein
Collagen is an example of ECM and belongs to which family
Fibrous proteins
this ECM provides strength to a tissue and is the MOST abundant protein in mammals
collagen
this fibrous protein (ECM) provides elasticity to a tissue as well as flexability
elastin
T/F: some fibrous proteins have an adhesive role
True
False
True. Fibronectin and Lamina (both technically glycoprotein)
The structural and adhesive molecules in PLANT cells
cellulose
adhesive ;
pectins
Author
jmali921
ID
53569
Card Set
Chapter 19 ECM and junctions
Description
ECM
Updated
2010-12-06T19:37:12Z
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