Blood clotting involves platelets.
A tangled mesh of blood cells is called a blood clot.
Platelets
Those are called, "Platelets".
stationary clot is called a thrombus or a blood clot.
Platelet cells are the component within blood cells that help control bleeding by helping blood to clot.
White blood cells help clot the blood. Low PH makes red blood cells clump together
You need to be more descriptive with your question. There are lots of things that could be called "clot tubes". Small blood vessels are called capillaries. The blood cells that play a primary role in clotting are called platelets.
platelets
Blood clot
the part of the blood that closes a wound is called the platelets.
When fibrinogen is converted to fibrin during the blood clotting process, it forms a mesh that traps blood cells and solidifies the clot. The remainder of the liquid part of the blood, after the clot has formed, is called serum. Serum is essentially plasma minus the clotting factors, including fibrinogen.
red blood cells