Cytoskeleton & Movement Do Now: Identify the super-important cell parts that do each of the following functions: Cellular respiration Transports molecules out of the cell CO2 + H2O  CH2O + O2 Make proteins Stores information about protein structures.

Cytoskeleton

Cytoskeleton Just like your body has a skeleton to maintain its shape and size, cells have a cytoskeleton to do the same thing.

Microfilaments are the smallest strands of the cytoskeleton

Microfilaments are a polymer of a protein called actin. They’re used for cell movement and muscle contraction

Microtubules are larger strands and are thicker and stronger.

Microtubules are hollow tubes made of a protein called tubulin.

During cell division, spindle fibers move chromosomes apart During cell division, spindle fibers move chromosomes apart. Spindle fibers are microtubules.

Cell Part: Centrosome & Centrioles The centrioles (2 per centrosome) are responsible for coordinating the division of chromosomes during eukaryotic cell division.

Centriole Structure: Interesting Bio-geometry

Movement Some cells move using organelles called cilia and flagella

Cilia are small hair-like structures on the outside of a cell.

If a cell has cilia, it always has a lot of them!

Cilia (and flagella) are made of microtubules bundled together.

Flagella are much bigger than cilia, and cells that have them only have a few.

One More Way to Move: Pseudopodia Means “false foot” Think blob

How do cells move? Cilia: many tiny beating “hairs.” Flagella: a few long, whip-like propellers. Pseudopodia: flow from 1 spot to another. Do The Dance….

Movement in Animals What body systems work together to make you move? How is that similar to the cell systems we just learned about?

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