25.
Centrioles
a.
-
Centrioles function in what?
26.
Cytoskeleton
a.
-
The cytoskeleton is what?
i.
Flexible lattice of fibrous proteins, called filaments, that give the cell structure and
support. Not rigid or fixed, and can aid in intracellular transport of materials,
suspension of organelles, formation of adhesions with other cells, contraction,
and movement of certain cells
b.
-
What are microfilaments, microvilli, intermediate filaments, and microtubules
(specifically cilia and flagella)?
i.
Microfilaments have the smallest diameter. One called actin, has man functions,
such as muscle contraction, amoeboid-like movement of cells, and separation of
cytoplasm during cell division
ii.
Microvilli, are found in epithelial cells that are specialized for the exchange of
molecules
iii.
Intermediate filaments - a diameter of 10nm between those of microfilaments and
microtubules; tend to be stronger and more stable tan microfilaments. Some
called keratin, are found in skin and hair cells. Myosin is also found in muscle
cells, working with actin to produce contraction
iv.
Microtubules (25nm) largest diameter, consists of long hollow tubes. Form
spindle fibers, cilia, and flagella
27.
Cell-to-Cell Adhesions
, 2.3
page 39
a.
-
Cell adhesions are made up of what kind of molecule?
28.
Tight Junctions
29.
Desmosomes
a.
-
Desmosomes are found in what kind of tissue?
i.
Found in tissues subject to mechanical stress, such as the heart, uterus, and
skin. A desmosome is a filamentous junction between two adjacent cells that
provides strength so that the cells do not tear apart when the tissue is subjected
to stress.
ii.
Each desmosome contains a plaque formed by glycoproteins clustered inside
each cell. Cadherins extend from this plaque, which are protein filaments that
cross the plasma membrane into the EC space. The cadherins are linked to
intracellular filaments at the plaque
b.
-
What is the plaque and cadherins?
