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4. This question is based on the information provided in the accompanying diagram. The experimental set up is the same as in the previous question. Drug Y is administered before and after timolol. Drug Y is most likely:

(A) Bradykinin

(B) Histamine

(C) Isoproterenol

(D) Acetylcholine

(E) Phenylephrine

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Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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