Cytoskeleton & Movement Do Now: 1.Turn in Homework, get out notes from Friday (cytoskeleton) 2.Cell City analogies: If you havent done so, add ribosomes to the ER row, because it should be Endoplasmic reticulum + ribosomes. Finish any anaolgies you haven’t completed yet.

Cell City Presentations Your project should include: –Analogy reasoning for each part –A representation of each part that makes sense Due Monday: 1 week. Don’t waste time!

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. Spindle fibers are microtubules.

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….