Cytoskeleton & Movement Do Now: 1 st : Take out homework Identify the super-important cell parts that do each of the following functions: 1.Cellular respiration 2.Transports molecules out of the cell 3.CO 2 + H 2 O  CH 2 O + O 2 4.Make proteins 5.Stores information about protein structures.

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….

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

Homework Read “cytoskeleton,” “cilia & flagella” pp Answer SR #5 on p. 83