Alexander Shulgin gave two lectures about "the plumbing of the human body".
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LECTURE 4: The Plumbing of the Human Body
Overview
Pharmacokinetics and Pharmacodynamics
How Drugs Get into the Body
Drug Administration Methods
Biotransformation:
The Half-Life of Drugs in the Body
Metabolic Interactions of Drugs
LECTURE 5: More Body Plumbing & the Nervous System
Overview
Biotransformation Continued:
Absorption, Excretion, and Routes
Administration Methods and their Effects on Drugs
The Nervous System
The Central Nervous System
The Autonomic Nervous System
Nerves, Structure, and Function
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Transcripts are included in
The Nature of Drugs Vol. 1.