The veins of a leaf contain the
a.
apical meristem
c.
endodermis
b.
epidermis
d.
vascular tissue

Option c. endodermis

greek word endon, within + derma,skin; the layer of living cells, with various characteristically thickened walls and no intercellular spaces, which surrounds the vascular tissue of certain plants and occurs nearly all roots and certain stem and leaves.

The 3 steps are vasoconstriction, temporary blockage of a platelet plug, formation of a fibrin clot better known as coagulation.