8. Terminology on Pharmacology.

#	Terminology	Academic Definition	Scientific Mechanism	Real-World Application	Example
11	Pharmacology	The scientific study of drugs and their interactions with living systems.	Examines molecular targets, physiological responses, and drug disposition.	Used to understand therapeutic effects, adverse effects, and drug development.	Studying how beta-blockers reduce cardiovascular activity.
12	Pharmacodynamics	The study of biochemical and physiological effects of drugs and their mechanisms of action.	Relates drug concentration at a target to biological response.	Helps determine how medicines produce therapeutic effects.	Salbutamol stimulates beta-2 receptors and relaxes bronchial smooth muscle.
13	Receptor	A biological macromolecule that recognizes ligands and initiates or modifies cellular responses.	Ligand binding causes conformational changes and downstream signaling.	Many medicines are designed to activate or block specific receptors.	Histamine H1 receptors are blocked by antihistamines.
14	Agonist	A ligand that binds to and activates a receptor to produce a biological response.	Stabilizes receptor conformations that trigger intracellular signaling.	Used when stimulation of a biological pathway is therapeutically beneficial.	Salbutamol is a beta-2 receptor agonist.
15	Antagonist	A ligand that binds to a receptor and blocks or reduces activation by an agonist.	Occupies the receptor without producing the same activating response.	Used to suppress excessive or harmful physiological signaling.	Naloxone blocks opioid receptors during opioid overdose.
16	Affinity	The strength or tendency with which a drug binds to a molecular target.	Depends on intermolecular forces such as ionic, hydrogen-bonding, and hydrophobic interactions.	Helps determine target binding and drug selectivity.	A high-affinity antagonist may bind effectively at low concentrations.
17	Potency	The amount or concentration of a drug needed to produce a specified effect.	Determined from dose-response relationships such as EC50.	Helps compare the doses required for different medicines.	Drug A may produce the same effect at 5 mg that Drug B produces at 50 mg.
18	Efficacy	The capacity of a drug to produce a maximal biological effect.	Depends on receptor activation and downstream signaling efficiency.	Helps compare the maximum achievable effects of drugs.	A full agonist generally has greater maximal efficacy than a partial agonist.
19	Therapeutic Index	A comparative measure of doses or exposures producing therapeutic versus toxic effects.	Reflects the separation between effective and harmful drug concentrations.	Helps characterize medicine safety.	Lithium requires close monitoring because of its relatively narrow safety margin.
20	Dose-Response Relationship	The quantitative relationship between drug dose or concentration and its biological effect.	Increasing concentration increases target engagement until a maximum response is approached.	Used to determine appropriate therapeutic dose ranges.	Clinical studies establish how blood-pressure reduction changes with increasing drug dose.