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Unformatted text preview: s in its center (a structure
called an axoneme) and is formed from a basal body (B)
organizing center at the cell periphery. Most cells have 1
(and microvilli) 9+2, made of tubulin (hard to see microscopically) -- mysterious… Fxn: To move material across surface of epithelia -- found in TRACHEA -- move mucus upwards towards oral cavity! but seem to be related
to SENSORY fxn in cell -- 9+2 like axoneme,
but diff fxn… Fig. 4-10 Dyein is an ACTIVE
protein -- motor
which binds to
along it In the axoneme one
MT of each doublet
has bound “arms” of
dynein which associate
with tubulin in the
neighboring MT, pulling
the two MTs along one
another slightly. This
rapidly around the
produces a flailing or
beating movement of
the cilium. Dyein projecting from
1 doublet interacts
doublet. This causes the doublet
arms to SHIFT past
eachother! This shift causes entire
axoneme to BEND. 9+3, forms ROOT out of which
an axoneme grows!!!!
This "bend" -- shape change -occurs rapidly as a "FLAIL"
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This document was uploaded on 02/04/2014.
- Spring '14