Biology/How many minutes to draw 2 liters of blood?
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Question
How many minutes does it take to draw to liters of blood from the veins in the arm by a needle?
Dear Vera,
It depends on the individual's blood pressure and other factors. But taking two liters would not be advisable, as it would severely affect the individual's blood pressure and other homeostatic mechanisms. It takes about 10 minutes to donate about 1/2 liter of blood. And that's all one should ever take at one time, unless under very unusual circumstances and under the supervision of a physician.
Dana
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Answers by Expert:
Dana Krempels, Ph.D.
Expertise
I can answer biology-related questions in the areas of evolution, zoology, botany, genetics, and ecology. But I don't answer homework questions or provide ideas for your science fair projects. So students please do your learning the right way by reading your text assignments and studying!
Experience
At the University of Miami, I teach Evolution and Biodiversity, Botany, Zoology, Genetics, Ecology, and a variety of seminars (e.g., the Biology and Evolution of Human Gender Roles).
Education/Credentials
I have a B.S. in Biology and an A.B. in English from the University of Southern California (1980).
I earned my Ph.D. in Biology in the area of evolutionary biology/visual physiology from the University of Miami in 1989.
Past/Present Clients
I am currently an "expert" in both the "Rabbits" and "Wild Animals" categories.
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