Answer to Question 1
C
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Acetylcholine (ACh) is an ester of acetic acid and an organic alcohol called choline. Cholinergic nerves use choline, obtained in the diet, to produce ACh. Tyramine and tyrosine are associated with norepinephrine production. Bilirubin is not a neurotransmitter.
Answer to Question 2
B
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Heparin blocks the formation of thrombin from prothrombin. Heparin does not bind to factors X and Xa. Heparin does not inactivate factor VIII.