2006-12-11 15:17:20 · 3 answers · asked by ~ korry ~ 1 in Science & Mathematics ➔ Biology
They don't use a special protein- they are made of fragments of bone marrow cells and have no nuclei.
2006-12-11 16:07:45 · answer #1 · answered by Lime745 3 · 0⤊ 0⤋
These are 3 basic stages in the clotting process: (13 altogether)
Stage 1 - Platelets + damaged cells -> thromboplastin which initiates the event
Stage 2 - Prothrombin---->(thromboplastin)---> thrombin
Stage 3 - Fibrinogen-----> (thrombin)----> fibrin
Everything on left is already present in the body.
Everything on the right in present only when clotting occurs.
2006-12-12 00:45:15 · answer #2 · answered by Suga 3 · 0⤊ 0⤋
Fibrin.
It is activated (crossed link) by Factor VIII. This crossed link allows clotting in blood. This also produces in Liver.
2006-12-12 00:17:49 · answer #3 · answered by Dr. Zoo 3 · 0⤊ 0⤋