Biology/human blood
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Question
In how many seconds blood circulates all over the human body. From heart to
heart again?
Thanks for using AllExperts, Ali.
How quickly blood circulates around the body depends upon a number of factors, so it's difficult to give a simple answer. Blood volume is the most obvious variable: a larger person with a greater volume of blood requires more time for circulation. The body compensates for this, though, by increasing the amount of blood ejected by each heartbeat.
Heart rate also affects the circulation time: during exercise, blood may move through your circulatory system two or three times as fast as it does at rest. However, I can give you some values from the scientific literature, so long as you keep in mind that these values can vary quite a bit.
In resting adults, blood makes one circuit (from heart back to the heart again) in about sixty seconds. The time goes down from there if you're exercising, nervous, or even walking slowly; that is, any exertion above the resting level leads to the blood moving more quickly, which means less time for it to make a circuit in the body.
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Answers by Expert:
John Locke
Expertise
I will answer all biology-related questions through the undergraduate level. I will explain unclear concepts and suggest approaches to solving problems, but would prefer not to completely solve homework problems for you. If you are completely stumped on homework, tell me what you already know and I will help you as much as possible. Please do not ask me for ideas on school research projects; part of research is determining a suitable area of investigation, and that's not a task that should be completed by someone else. Please don't simply send me your homework for solutions. If you are having difficulty after you have started an analysis, I will be happy to direct your thinking; in particular, I would prefer to not simply solve pedigrees for students, but I will be happy to assist in solving pedigrees that you have already started. If you don't understand how to analyze a pedigree, I'd highly recommend watching this video, in which a biology professor explains the basic concepts of pedigree analysis: http://www.youtube.com/watch?v=HbIHjsn5cHo
Experience
I have a BS in Bioengineering with a concentration in Chemical Engineering (which included a heavy focus on biology), and have taught biology, biochemistry, and related subjects for some time now.
Education/Credentials
BS Bioengineering, Penn State University
MCAT/DAT/OAT Instructor
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