Biology/blood
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Question
I need proof from an expert for my 7 yo grandson. He believes that blood is blue until it escapes from the body, comes in contact with oxygen, and turns red. Could you please set him straight?
People have blood drawn every dsy and it i sdrawn into a vacuum tube. Vacuum tubes have no air and therefore no oxygen in them and the blood taht fills them is dark red not blue.
Also tell him that when we s ee color we see reflected light. Since blood in the body is not reflecting any light it has no color
See if you can find some photos of people giving blood and ask what color the blood is in the bag
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Questioner's Rating
| Rating(1-10) | Knowledgeability = 10 | Clarity of Response = 10 | Politeness = 10 |
| Comment | Thanks! I don't think he will be able to grasp the "reflected light" concept though! | ||
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Answers by Expert:
Walter Hintz
Expertise
Science teacher for over 50 years. MSc. in biology. I can answer questions in general biology, zoology, botany, anatomy and physiology and biochemistry.
Experience
I have a MSc in biology and have been a science teacher for over 50 years. At present I am a faculty member at a college and a science consultant at seven catholic schools.
Publications
The Ohio journal of Science
Momentum-The Journal of the Catholic Education Association
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