Normal hemostasis and coagulation hemostasis: 1. Vessel wal (1)vessel spasm: reflex spasm SHT↑ slow down blood flow (2) subendothelial connective tissue encouraging platelet adhesion, activation aggregation (3) releasing TF, activating FXII triggering intrinsic and extrinsic pathway (4) pression of haematomaNormal hemostasis and coagulation • hemostasis: 1. Vessel wall: (1)vessel spasm: reflex spasm S-HT↑ slow down blood flow (2)subendothelial connective tissue: encouraging platelet adhesion, activation, aggregation (3)releasing TF, activating FⅫ: triggering intrinsic and extrinsic pathway (4)pression of haematoma