Drugs activity extrinsic and intrinsic

This video tells us about the activity of a drug as it becomes a part of the body system and basic terms related to pharmacodynamics like affinity, intrinsic activity and therapeutic doses and index. TIMELINE: 0:03 Introduction 0:09 Factors on which drug effect depends 0:22 Affinity 0:46 Affinity lock and key model 0:52 Intrinsic activity or efficacy 1:07 Conclusion