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Centrioles & Related Organelles

Centrioles & Related Organelles. Three functions of microtubules & microfilaments: assist cellular movement gives cell an internal cytoskeleton anchors organelles. Muscle Contraction. Why are microfilaments thought to be involved in muscle contraction?

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Centrioles & Related Organelles

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  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

  4. How do cilia & flagella differ? • Cilia are shorter than flagella • Often there are many cilia & one or two flagella

  5. 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

  6. 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)

  7. 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)

  8. Another look at flagella/basal body relationship…

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