What is the correct sequence of events leading to the formation of a blood clot?
There are two major facets of the clotting mechanism - the platelets, and the thrombin system.
The platelets are tiny cellular elements, made in the bone marrow, that travel in the bloodstream waiting for a bleeding problem to develop. When bleeding occurs, chemical reactions change the surface of the platelet to make it "sticky." Sticky platelets are said to have become "activated." These activated platelets begin adhering to the wall of the blood vessel at the site of bleeding, and within a few minutes they form what is called a "white clot." (A clump of platelets appears white to the naked eye.)
The thrombin system consists of several blood proteins that, when bleeding occurs, become activated. The activated clotting proteins engage in a cascade of chemical reactions that finally produce a substance called fibrin. Fibrin can be thought of as a long, sticky string. Fibrin strands stick to the exposed vessel wall, clumping together and forming a web-like complex of strands. Red blood cells become caught up in the web, and a "red clot" forms.
A mature blood clot consists of both platelets and fibrin strands. The strands of fibrin bind the platelets together, and "tighten" the clot to make it stable.
In arteries, the primary clotting mechanism depends on platelets. In veins, the primary clotting mechanism depends on the thrombin system. But in reality, both platelets and thrombin are involved, to one degree or another, in all blood clotting.
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Which of the following shows the correct sequence of events leading to the formation of a blood clot?
Many events occurred after our Universe began to expand from an infinite state of density, including inflation, baryogenesis, quark formation, hadron formation, lepton domination, photon domination, nuclear formation, matter domination, recombination, re-ionization, star formation, galaxy formation.
Baking a cake usually involves a specific sequence of steps to follow. To open the safe in the bank's central office, you must enter the correct code numbers in the proper sequence, as otherwise it will be sealed off by its security system. The police were able to establish the sequence of events that led to the accident.