how does your skin repair itself when you get a cut ?
DESCRIPTION
How does your skin repair itself when you get a cut ?. Why do cells divide?. 1.) Growing organisms need more cells W hat would happen if your cells stopped dividing? S kin cells…what would happen if your skin cells stopped dividing?. 2.) To replace damaged or worn out cells B loody knee - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/1.jpg)
![Page 2: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/2.jpg)
![Page 3: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/3.jpg)
![Page 4: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/4.jpg)
![Page 5: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/5.jpg)
How does your skin repair itself when you get a cut?
![Page 6: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/6.jpg)
Why do cells divide?1.) Growing organisms need more cells– What would happen if your cells stopped dividing?– Skin cells…what would happen if your skin cells
stopped dividing?
![Page 7: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/7.jpg)
2.) To replace damaged or worn out cells– Bloody knee– Peeling skin after a sunburn
![Page 8: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/8.jpg)
3.) As cells grow, their volume is far too big for their surface area, and they can’t get nutrients in and waste out fast enough
![Page 9: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/9.jpg)
What is the goal of cell division?
• To produce two identical cells called daughter cells.
PARENT CELL
TWO IDENTICAL DAUGHTER CELLS
![Page 10: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/10.jpg)
The Cell Cycle
2 Major Phases of Cell Division1.) Interphase G1 Stage – primary growth phase
S Stage- synthesis; DNA replication G2 Stage – secondary growth phase
2.) Cell division (M-Phase) M – Mitosis C - Cytokinesis
![Page 11: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/11.jpg)
![Page 12: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/12.jpg)
Interphase – G1 Stage
• 1st stage after cell division
• Cells mature by making more cytoplasm and organelles
• Cell carries on its normal, everyday metabolic activities
• *This is the longest stage of the cell cycle
![Page 13: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/13.jpg)
Interphase – S Stage
• Synthesis stage • DNA is copied or
replicated
- Two identical copies of DNA
- Each new cell is identical to the parent cell
PARENT DNA
*Why is it important that each new cell is IDENTICAL to the parent cell?
![Page 14: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/14.jpg)
Keeping Cells Identical
• The instructions for making cell parts are encoded in the DNA, so each new cell must get a complete set of the DNA molecules
PARENT DNADNA replication occurs in S stage in the parent cell
![Page 15: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/15.jpg)
Interphase – G2 Stage• 2nd Growth Stage
• Occurs after DNA has been copied
• All cell structures needed for division are made (e.g. centrioles)
• Both organelles & proteins are synthesized
• Everything must be in order for the cell to divide
• **Critical Checkpoint
![Page 16: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/16.jpg)
Cell Division M-Phase (Mitosis and Cytokinesis)
• Mitosis (division of the nucleus)– Divided into 4 stages– 1.)Prophase– 2.)Metaphase– 3.)Anaphase– 4.)Telophase
• Cytokinesis evenly divides the cytoplasm
![Page 17: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/17.jpg)
![Page 18: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/18.jpg)
![Page 19: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/19.jpg)
So how does your skin repair itself when you get a cut?
Cellular division!
When you cut your skin, the cells at the edge of the injury are stimulated to divide rapidly ....interphase begins!
![Page 20: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/20.jpg)
Cells where mitosis occurs in YOUR body
Lifespanlife span = 2 weekslife span = 4 monthslife span = 300-500 dayslife span = 4-5 days
Cell Type-Skin Cell-Red Blood Cell-Liver Cell-Internal linings (Intestines)
![Page 21: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/21.jpg)
In your groups discuss…
1.) How do cancer cells grow?
2.) How does chemotherapy fight cancer (and what cause negative side effects?)
![Page 22: How does your skin repair itself when you get a cut ?](https://reader035.vdocuments.net/reader035/viewer/2022062517/56812d03550346895d91dba0/html5/thumbnails/22.jpg)
http://ed.ted.com/lessons/how-do-cancer-cells-behave-differently-from-healthy-ones-george-zaidan