How does a blood platelets promote blood clotting?

No

we can say that blood clotting is a function of blood because plasma is involved in blood cloting and plasma is a consituent of blood.

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Blood cannot clot so quickly that it actually prevents a successful blood draw. If that were the case, you entire vascular system would be one giant clot. The only reason that a phlebotomist is...

If blood platelets did not cause clotting, a person could bleed to death through an insignificant wound, whether on the exterior of the body or internally.