figure 16-18 Model of human platelet homeostasis. Reproduced from Gorman, R. R. (1979). Modulation of human platelet function by prostacyclin and thromboxane A2. Fed. Proc. Fed. Am. Soc. Exp. Biol. 38, 83.

figure 16-19 Platelets change shape when exposed to ADP, which is liberated from platelet dense granules. Platelets are smooth flat disks shown in the electron micrograph at the left. Treatment with ADP causes long processes to protrude from the platelets, which swell to become irregular "spiny spheres." The processes then adhere to a surface or to other platelets, shown on the right. Reproduced from Zucker, M. B. (1980). Sci. Am. 242, 86-103.

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