Serotonin is sexreted by
platet seretonin normally the seratonin secreted from the enterochromaffin cells enters the blood stream . the platelets when bind to the clot release seratonin where it xan help in vaso constriction or dilation and hels in hemostasis Ref: Katzung 12 th ed.
Leukocytes
RBCs
Platelets
Vessel wall
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