Blood Flow & Circulatory System Simulator Community
Questions, answers and tips from people who use the Blood Flow & Circulatory System Simulator. Follow blood from the heart through arteries, arterioles, capillaries and veins, and see how strongly flow depends on vessel radius..
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This page shows only real posts from real people, so it starts empty. The guide below has the questions people most often have about the Blood Flow & Circulatory System Simulator. Pick one to start a thread, or write your own.
From the tool guide: common questions about Blood Flow & Circulatory System Simulator
The items below are not posts by community members. They come from the written guide for this tool and are here to get a conversation started. Use “Ask a follow-up” to open a thread about any of them.
Why does a small change in blood vessel radius change flow so much?
Because flow depends on radius to the fourth power, so halving the radius cuts flow to about one sixteenth.
From the tool guide Ask a follow-upWhere does blood pressure fall the most in the circulatory system?
Across the arterioles, which is exactly why the body uses them to control blood pressure and how much blood organs receive.
From the tool guide Ask a follow-upKey ideas
- Poiseuille's law: flow is proportional to the fourth power of the vessel radius.
- Arterioles are the body's main resistance vessels because their radius changes the most.
- Blood pressure falls steadily along the vascular tree, dropping fastest across the arterioles.
- Higher blood viscosity or lower driving pressure both reduce flow.
Things to try
- Halve the arteriole radius and predict the drop in flow before checking.
- Raise blood viscosity and compare it with the effect of the same percentage change in radius.
- Read the pressure-along-the-tree graph and find where pressure falls fastest.
Where this is used
This r⁴ relationship is why blood-pressure medications that dilate arterioles work so powerfully, and why cholesterol plaques that narrow arteries are so dangerous.
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