The following diagram shows part of the blood clotting cascade.
Enzyme A acts on fibrinogen.
Identify enzyme A.
Substance B is an insoluble protein formed by fibrinogen.
Identify substance B.
[1]
State the purpose of substance B in the body.
[1]
Blood clotting is essential for the healing of wounds, but can be life-threatening if it occurs in the coronary arteries.
Define the term 'coronary arteries'.
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