Circulatory Systems

Let's extend our general idea of a circulation to include devices, vertebrates and insects together. All circulations solve supply and demand problems: how to distribute flow to points where it is needed, and when supply and demand are both high, to match an area's need to appropriately increased flows. Needs and flows constantly change. For example, in a running vertebrate, blood shunts to muscles at the expense of the intestines. After eating, blood flows to our intestines limiting the supply to muscles. This is why, after dinner, so few of us push back from the table to run the mile.

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