1. Centrioles & Related Organelles
Three functions of microtubules & microfilaments:
assist cellular movement
gives cell an internal cytoskeleton
anchors organelles

2. Muscle Contraction
Why are microfilaments thought to be involved in muscle contraction?
Microfilaments have a composition similar to actin and myosin (two proteins used in the contraction of muscles)
More on this much later!!! 

3. Where do we find microtubules?
Cilia
Centrioles
Flagella
Cytoplasm/basal bodies
What is the function of cilia & flagella?
Involved in movement
How do cilia & flagella differ?
Cilia are shorter than flagella
Often there are many cilia & one or two flagella

4. Here’s the internal structure of cilia & flagella.
Description: Membrane bound cylinders; inside there are 9 microtubule pairs arranged in a circle around 2 central microtubules. Called a “9 + 2” pattern of microtubules

5. How are basal bodies related to cilia?
Each cilia or flagella has a basal body at its base (in cytoplasm)
They organize the structure of the cilia/flagella
Arranged in “9+0”
pattern (9 microtubule
triplets)

6. How are centrioles related to basal bodies?
Also have 9+0 pattern of microtubules
Give rise to basal bodies
How are centrioles important for mitosis in animal cells?
Involved in appearance/disappearance of spindle apparatus (pulls apart chromatids)

7. Another look at flagella/basal body relationship…