1 / 13

Fun Fact!

Fun Fact!. There are over 200 different types of cells in the human body, each performing specific functions! Nerve cells, eye cells, cardiac cells, etc. Do all types of cells go through the cell cycle at the same rate? NO!

mahsa
Télécharger la présentation

Fun Fact!

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. Fun Fact! • There are over 200 different types of cells in the human body, each performing specific functions! • Nerve cells, eye cells, cardiac cells, etc. Do all types of cells go through the cell cycle at the same rate? NO! Some cells divide quickly & some divide slowly. Some types of cells do not undergo cell division at all!

  2. Different cell types divide at different rates! • Muscle & nerve cells do not divide once they have developed! • Has anyone ever told you that once you kill your brain cells, you don’t get them back? • Skin cells & cells in the bone marrow divide rapidly!

  3. Regulating the Cell Cycle

  4. Control of Cell Division • Cell growth & cell division can be turned on & off. When you’re injured, your cells divide rapidly to repair the injury. When the injury has healed, the cells stop dividing.

  5. Regulating Cell Division • Proteins called Cyclins are present when the cell is dividing & are absent when the cell is not dividing. • They regulate the timing of the cell cycle. • Internal Regulators: signals from within the cell to regulate the cell cycle • They make sure everything is complete before moving on!

  6. Regulating Cell Division • External Regulators: stimulate or suppress cell growth by recognizing the surrounding situation • Injury Repair • Embryonic Stem Cell Differentiation

  7. Uncontrolled Cell Growth What happens when your cells lose control & cannot regulate their cell cycle? • When cells in your body cannot control cell growth & division, cancer may form. • Cancer cells cannot respond to the signals that regulate the division of cells.

  8. Uncontrolled Cell Growth • When cancer cells have been dividing uncontrollably, tumors form. • Tumors can damage surrounding tissue. • Cells from tumors can break free & travel to other parts of the body, forming new tumors.

  9. Benign vs. Malignant Tumors • Benign tumors do not spread to other parts of the body; they are non-cancerous! • The cells have a normal shape & grow slowly. • Tumors can become malignant (cancerous) & the cells can metastasize (get into the blood vessels & spread to other parts of the body). • Cancer cells have a different shape than normal cells & grow very quickly.

  10. Cancer • Cancer cells tend to have a damaged oncogene. • This gene possesses the information needed to respond to internal & external regulators.

  11. How do cells lose control? • Some reasons that cells may lose the ability to control growth: • Smoking • Radiation Exposure • Viral Infection • Scientists who study cancer research how cells divide.

More Related