This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Paial thromboplastin time correlates with 
Select and explain. 
A. Intrinsic and common pathway, B. Extrinsic and common pathway, C. Fibrinogen level, D. Function of platelets
D: Function of platelets
Answer: D: Function of platelets 
Explanation: ref Robbins 8/e p120,666 ,;7/e p 69;9/e p80 Shoened APTT demonstrates hypercoagulation and high MOPEG levels indicate increased catecholamine metabolism. A direct correlation between APTT and MOPEG was found herein, demonstrating a link between catecholamines and the process of coagulation. Catecholamines may interact with the a2-adrenergic receptors located on platelets and conve factor XII to XIIa or through the kallikrein-kinin system, they may activate factor XII. The activation of factor XII initiates the intrinsic coagulation pathway, which is monitored by APTT. It is suggested to control patients with a shoened APTT and increased sympathetic activity with the aim of preventing secondary coagulation and cardiovascular accidents by administering anti-thrombotic and anti-adrenergic agents It correlates with clotting factor 12 and function of platelet