<P> They excrete two chemicals that aid in the body 's defenses : histamine and heparin . Histamine is responsible for widening blood vessels and increasing the flow of blood to injured tissue . It also makes blood vessels more permeable so neutrophils and clotting proteins can get into connective tissue more easily . Heparin is an anticoagulant that inhibits blood clotting and promotes the movement of white blood cells into an area . Basophils can also release chemical signals that attract eosinophils and neutrophils to an infection site . </P>
<P> They excrete two chemicals that aid in the body 's defenses : histamine and heparin . Histamine is responsible for widening blood vessels and increasing the flow of blood to injured tissue . It also makes blood vessels more permeable so neutrophils and clotting proteins can get into connective tissue more easily . Heparin is an anticoagulant that inhibits blood clotting and promotes the movement of white blood cells into an area . Basophils can also release chemical signals that attract eosinophils and neutrophils to an infection site . </P>
what do white blood cells release to attract other white blood cells
what do white blood cells release to attract other white blood cells
Heparin
Heparin