Question

why platelets do not clot blood in blood vessels

Answer 1

Answer:

Platelets are special blood cells. And clotting or coagulation factors are types of proteins found in the blood. Platelets and coagulation factors clump together to heal broken blood vessels. This helps control bleeding.

Explanation:

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Answer 2

Answer:

They form in your bone marrow, a sponge-like tissue in your bones. Platelets play a major role in blood clotting. Normally, when one of your blood vessels is injured, you start to bleed. Your platelets will clot (clump together) to plug the hole in the blood vessel and stop the bleeding.