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Thursday, March 11, 2010
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This is the blog for Ms. Hero's Biology Class at Carlmont High School. Articles related to what we are studying in class will be posted with prompts for student response.
How to Post a Comment
- 1. Read Ms. Hero's blog post, any links on the post, and all the comments that have been left so far.
- 2. Pick one post and make a comment and sign with your FIRST name and LAST INITIAL ONLY, followed by your class period.
- 3. Write a paragraph comment based on the article and/or what other students have commented on.
Grading Rubric
- 20 Points: Relates article to what we are learning in class, grammatically correct, 5-7 sentences.
- 15 Points: Relates article to what we are learning in class, some grammatical errors or not 5-7 sentences.
- 10 Points: Doesn't relate article to what we are learning, grammar errors, or not 5 to 7 sentences.
Posts
Most people assume that blood is blue when it is in the veins than when in the arteries because veins contain less oxygen. But that is not true. As the article says, "blood that contains very little oxygen appears dark brown (the color red is due to the mixture of hemoglobin, iron and oxygen), but certainly not blue." The color of our blood can depend on our skin color. Such as if your skin is white toned, blue light may be penetrated on the skin but it's definately not blue.
ReplyDeleteThe blood/veins appear to be blue because the colors reflections are distorted by the skin. Blue light passes through the skin easier than red does, so the veins appear blue when they are actually red. Blood does change color depending on how much oxygen it has, but it is not a noticeable change. It will change from red to a dark brownish color due to the low oxygen and high levels of iron and hemoglobin. It is not a change that our eyes would be able to notice.
ReplyDeleteMany people think that blood is blue when it is inside our veins, but then becomes red when it is exposed to oxygen. However, this is not true. People with light skin see their veins as blue because of the light and color penetration off the skin. Through the skin, other color lights are absorbed, and blue light is reflected. As a result, we see blue when we look at our veins, so many people think that the blood and veins are blue. Blood is never blue, but it appears that way because of the skin.
ReplyDelete