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the red blood cell
Our white blood cells' jobs are to protect us. When the skin is cut, the white blood cells move torward the cut, and start forming the scab.
Platelets.
If blood wouldn't clot then when someone got a cut his blood would never stop leaking from it. Now that the blood does clot the hole will be filled up and the blood would stop.
the clot
The flow of blood to tissues beyond the clot may be cut off
If a clot forms in a blood vessel it would be harmful as pressure would rise. Also, if the clot completely clogs an artery or vein blood cannot pass and you could die from lack of oxygen/circulation.
The same process that creates problem blood clots leading to strokes are the same helpful processes that stops bleeding from a cut. The body sends platelets to the area. Platelets create a sticky cohesion between blood components and red blood cells. Macrophages rush to the area to begin cleaning up debris. The bleeding is stopped with the clot; healing begins. In a problem clot inside a blood vessel, the platelets' stickiness attacts more red blood cells. The blood components in the blood stream get caught against the clot, making it thicker. If the clot dislodges, it can travel to the heart or brain. Luckily, with a cut, the body reabsorbs the platelets and red blood cells that stuck together to make the clot. Soon, the clot is gone, the skin heals.
if you are asking what blood cells help blood clot up to keep your cut from bleeding out, they're platelets. :)
hemoglobing
I think so
Vitamin K in the blood helps the blood to clot.