Download Cell Surface/Intercell Communication Division

Cell Surface/Intercell Communication
Division
By Clint Lockwood, Jacob Hanson & Jaelyn Richter
Flagella, Cilia, and Cell Movement
Flagella: A lash-like appendage that protrudes from the cell body of certain prokaryotic and eukaryotic cells.
Cilia: A slender protuberance organelle that projects from a much larger cell body.
Cell Movement:
1. Response to an external signal in its surrounding environment
a. can be a physical, chemical, diffusible or non-diffusible signal that is detected by receptor proteins
i.
First, a cell propels the membrane forward by orienting and growing the actin network at its
leading edge.
ii. Second, it adheres to the substrate at the leading edge and releases at the cell body and rear of
the cell.
iii. Finally, contractile forces, pull the cell forward
Cell Walls
Cell Wall: A rigid layer outside the plasma membrane of the cells of plants, fungi, and
bacteria.
● Turgor pressure: pushes the plasma membrane against the walls of these cells
o
o
o
Healthy plants are turgid
Activates enzymes that allow for the cell wall to grow and expand
Rely on turgidity to maintain rigidity
o
Limited plasticity/rigidity prevents the cell from rupturing, provides protection, allows for cellular expansion
● Glue to bind neighboring cells together
● Determines mechanical/tensile strength
● Barrier to prevent other cells from getting to the cell
membrane
● Contributes to cellular communication
Extracellular Matrix (ECM)
Definition: A substance that contains collagen, elastin, proteoglycans, glycosaminoglycans, and fluid that is
produced by cells and in which the cells are embedded.
● Secreted by chondroblasts which is responsible for the properties of forming cartilage.
● Osteoblasts for bone
Functions:
Mechanical support for cells
Segregates tissues from one another
Regulates intercellular communication
Embryonic development
Importance:
For growth, wound healing, and fibrosis
Plasmodesmata
Plasmodesmata: microscopic channels which traverse the cell walls of plant cells and
some algal, enabling transport and communication.
1. Enables direct, regulated, simplistic transport of substances between cells.
2. There are two forms of plasmodesmata: primary plasmodesmata, which are
formed during cell division, and secondary plasmodesmata, which can form
between mature cells.
3. Transport of…
a. Messenger RNA
b. Proteins
c. Viral Genomes
d. Short Interfering RNA
Plasma Membrane
Cell Wall
Callose
Endoplasmic Reticulum
Desmotubule
Adhering Junctions
Adherens junctions: protein complexes that occur at cell–cell junctions in epithelial
and endothelial tissues, usually more basal than tight junctions
1. A cell junction whose cytoplasmic face is linked
to the actin cytoskeleton
1. The accepted model has been that adherens
junctions serve as a bridge connecting the actin
cytoskeleton of neighboring cells through direct
interaction
Works Cited
http://medical-dictionary.thefreedictionary.com/extracellular+matrix
http://biology.kenyon.edu/edwards/project/greg/pd.htm
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/J/Junctions.html
http://en.wikipedia.org/wiki/Flagellum
http://en.wikipedia.org/wiki/Plasmodesma
http://pixshark.com/flagella-cell-structure.htm
http://www.nature.com/nrm/journal/v10/n1/fig_tab/nrm2597_F2.html
http://www.lookfordiagnosis.com/mesh_info.php?term=Extracellular+Matrix&lang=1
http://themedicalbiochemistrypage.org/glycans.php
http://www.mayoclinic.org/diseases-conditions/pulmonary-fibrosis/basics/definition/con-20029091
http://www.ncbi.nlm.nih.gov/books/NBK21047/
http://uwf.edu/jgould/Importance%20of%20Intercell%20Comm%20p1.pdf
http://toxsci.oxfordjournals.org/content/68/2/265.full
http://www.uta.edu/biology/wilk/classnotes/cellphys/extracellular%20matrix.pdf
http://study.com/academy/lesson/extracellular-matrix-function-components-definition.html
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/E/ECM.html