Centrioles Related Organelles Three functions of microtubules microfilaments

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Centrioles & Related Organelles • Three functions of microtubules & microfilaments: ► assist cellular

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? • Microfilaments

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!!!

Where do we find microtubules? • Cilia • Centrioles • Flagella • Cytoplasm/basal bodies

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

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

 • Here’s the internal structure of cilia & flagella. • Description: Membrane bound

• 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

How are basal bodies related to cilia? • Each cilia or flagella has a

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)

How are centrioles related to basal bodies? • Also have 9+0 pattern of microtubules

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)

Another look at flagella/basal body relationship…

Another look at flagella/basal body relationship…