Abstract
The microcirculation was studied in the mesocecum of hypothermic rats. When capillaries of different types were compressed partially with a microneedle, there was a slowing of the blood flow and a striking fall in the hematocrit. It was possible to vary the hematocrit in the compressed vessel at will by varying the degree of compression. The hematocrit could be reduced almost to zero in situations where the flow in the parent trunk was rapid. This phenomenon was regularly observed when metarterioles and capillaries were compressed. The hematocrit could be reduced only slightly in situations where the flow in the parent trunk was slow, as for example when postcapillaries and venules were compressed. There was no significant change in diameter of the vessel except at the point of compression with the microneedle.
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