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The Inner Pharmacy — Neurotransmitters and Hormones

Section Opener: From Signal to Substance

The Serotonin System and the Lock-and-Key Mechanism

The Sleep-Serotonin Cycle

Knowledge Check: The Chemistry of Mood

The Second Brain and the Subjects of Chemistry

The Gut: Your Second Brain

The Subject Connection: Chemistry and Biology

The Subject Connection: Music, Art, Economics, and Sociology

Knowledge Check: The Second Brain

The body's chemical layer — hormones, neurotransmitters, the serotonin system, and the gut as a 'second brain' — and how that chemistry is the living root of chemistry, biology, music, art, economics, and sociology.

Your moods, your cravings, your sense of reward and calm — all of it is chemistry, mixed and delivered by your body every second. This module opens the chemical layer of the brain-body loop: serotonin and dopamine, the gut's 'second brain,' and the hormones that set your inner weather.

Module 2 — The Chemical Body: Hormones, Neurotransmitters, and the Second Brain

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