Question

When a blood vessel is damaged, the  ____________  fibers within the connective tissue beneath the endothelial cells in the vessel wall become exposed. Platelets adhere to these fibers with the assistance of a plasma protein called  ____________ . As the platelets start to stick to the vessel wall, their morphology changes dramatically. They develop  ____________  that further adhere them to the blood vessel wall. As more and more platelets aggregate to the site, a(n)  ____________  develops to close off the injury. This is a  ____________  measure to block the flow of blood to an area where a vessel wall is damaged. Platelets undergo this morphologic change and become activated. Their cytoplasm  ____________  releasing chemicals to assist with hemostasis.

Answer 1

When blood vessels are damaged , the COLLAGEN fibers within the connective tissue beneath the endothelial cells in the blood vessel become exposed.

Platelets adheres to the these fibers with assistance of plasma proteins called VON WILLE BRAND FACTOR .

As the platelets start to stick to the vessel wall , their morphology change dramatically. They develop LONG PROCESS that further adhere to the blood vessel wall.

As more and more platelets aggregate to the site , a(n) PLATELET PLUG develops to close off the injury. This is a TEMPORARY measure to block the flow of blood to an area where a blood vessel is damaged.

Platelet s undergo this morphological change and become activated. Their cytoplasm GRANULATES releasing chemicals to assist with hemostasis.