Science+Log+3

**Science Log 3**

**C. Collagen: talk with your partner about “collagen.” What do you know about it? Where might it be found?** 3. Case Study: A certain middle-aged biology teacher is concerned about her facial skin. She is experiencing sagging and increased wrinkling in her face, even though she applies sunscreen daily and wears a hat every time she goes outside.

a. Question to discuss and answer: How would you explain why she’s getting wrinkles and sagging skin? Remember, this is a biology teacher, so your explanation should include information about tissues.  b. She informs you that she’s purchased a jar of face cream (expensive!) that includes collagen and other moisturizers. She’s been using it daily, but she’s seen no promised improvements. How would you explain this? c. After your explanation, she asks you, “What topical applications or beauty products should I use to stop and reverse wrinkling? Why should I use those?”

**Research example: ** Google and wikipedia are great places to START when researching. They will give you terminology and ideas to further research. Another good place to look for general research is About.com. Search for a couple key terms like "wrinkles sagging" Second hit was "What causes wrinkles." This article summed up everything to be included in question part (a). Page 104 in your textbook explains part (b). Also search for "collagen cream" on About.com. The first hit summed up many points to include for part (c).

As you watch the video, think about the following questions. When the video is over, discuss your thoughts with peers and do further research to answer the questions. Your answers should be well-researched, thorough, thoughtful paragraphs! Remember… we’re studying Tissues!
 * Katie: My Beautiful Friends **

**1. Why doesn’t burned or damaged tissue heal naturally so that it returns to looking “normal?”**

**Research example: ** Again, Google and Wikipedia are great places to START when researching. First, understand "burns" by reading all your textbook has to say about burns (e.g. page 126). Next, read the wiki page about "burns." Google "heal damaged tissue" and there are many hits worthy of perusal. The fifth hit is from WiseGeek. This website in another great resource that simplifies information.

**2. Chantelle has an AVM – atrioventricular malformation. Why couldn’t the doctor simply remove the AVM and stitch her up?**

**Research example: ** Hopefully by this time you realize that tissues have MANY components. Also, in the show you saw how she had a tissue expander placed in her forehead. The AVM was so large that the doctors were going to use the skin tissue from her forehead expansion to replace the skin/tissue from her nose and face where the AVM had taken over. But of course you are going to research AVM on Google! There are many articles and trusted websites, but you must **filter** the information. Chantelle's AVM was NOT in her brain or spinal cord, it was on her nose/lip (skin and underlying tissue). General info about AVM's should be noted, then apply that info to what tissues need in general. Skin and most tissue NEEDS a good blood supply. AVMs are a tangled mass of arteries/veins without capillary systems. Capillaries are needed throughout tissues to bring nutrients/oxygen and remove waste/carbon dioxide. Chantelle's AVM is huge and it permeates the tissues in her nose, lip, and parts of her face. Doctors cannot simply "remove" it or "cut it off" because it is large -- what would be there to replace it? What would they "stitch"? (What is underneath skin/subcuaneous layer?) They took the expanded tissue from her forehead and stitched it over her nose, **being careful to connect blood vessels from her face to the new tissue**... but the blood started to clot at the suture/stitches and suffocate the replacement tissue...so they put leeches on her to thin the blood!