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PHARMA,PATHO AND GENETICS – PAPER SOLUTION NO.4 Section 1 Q.1 Define the following terms (any five) [5 marks] 1. Pharmacodynamics Pharmacodynamics is the branch of pharmacology that studies what a drug does to the body. It focuses on the mechanisms of action, biological effects, and the relationship between drug concentration and effect. 2. Drug A drug is any chemical substance that, when administered to a living organism, produces a biological