Activation time of blood platelets

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Abstract
Blood platelets react rapidly in their hemostatic function. Determination of the reaction or activation time of individual platelets is difficult because it requires that physical and/or chemical effectors of activation are nonlimiting. Analysis of experimental conditions shows that the best estimate of mean activation time comes fromin vivo measurements. Thus, the constancy of height-to-length ratio of a growing thrombus, and its change with flow rate, provide additional evidence for the activation time hypothesis.