1 / 12

The Cytoskeleton

The Cytoskeleton. Honors Biology Monkemeier Unit 4: Microscopes, Cell Structures and Functions, The Tree of Life. The Cytoskeleton.

tansy
Download Presentation

The Cytoskeleton

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Cytoskeleton Honors Biology Monkemeier Unit 4: Microscopes, Cell Structures and Functions, The Tree of Life

  2. The Cytoskeleton • The cytoskeleton of all eukaryotic cells is crisscrossed by a network of protein fibers that supports the shape of the cell and anchors organelles to fixed locations. • The network of protein fibers that compose the cytoskeleton is a dynamic system, constantly forming and disassembling.

  3. Cytoskeleton

  4. Protein Fibers

  5. Three Types of Fibers Compose Cytoskeleton • Actin Filaments (Microfilaments) • Actin filaments are responsible for cellular movements such as contraction, crawling, pinching during division, and formation of cellular extensions.

  6. Microtubules • Microtubules are the largest of the skeletal elements. • Along with facilitating cellular movement, microtubules provide organization to the cytoplasm and are responsible for moving materials within the cell itself.

  7. Intermediate Filaments • These filaments, once formed, are stable and usually do not break down. • Intermediate filaments include: vimentin, keratin, neurofilaments • Note the differences between intermediate filaments and microtubules or microfilaments.

  8. Working Together • The three fibers of the cytoskeleton interact with each other to modulate cell shape and permit cell movement and to act to move materials within the cytoplasm.

  9. Cytoskeleton • Functions as structural support; cell movement; movement of vesicles within cells. • It is present within the cells of all four eukaryotic kingdoms: Protista, Fungi, Plantae, Animalia

  10. Centrosomes • Animal cells and most protists contain a pair of structures known as centrioles. • These centrioles are barrel-shaped and are located near the nucleus. • The area within the cytoplasm that contains the centrioles is known as the centrosome.

  11. Centrosomes • The centrosomes of animal cells and protists function as microtubule-organizing centers. • They are also responsible for the reorganization of microtubules during cell division. • Plants and Fungi do not have centrosomes, but they do have microtubule-organizing centers.

  12. Cytoskeleton

More Related