Physiology
How the organs and systems of the body function.
Articles (8)
- How the Heart Works: Chambers, Valves, and the Cardiac Cycle
The heart is a four-chambered muscular pump. Learn how blood flows through its chambers and valves, how it keeps its rhythm, and what a heartbeat actually is. - How to Fix Your Sleep Schedule
A practical, evidence-based method to reset a broken sleep schedule — light timing, anchors, and the counterintuitive rule about wake time that does most of the work. - Circadian Rhythm Reset: How the Master Clock Works
The biology of the circadian system — the suprachiasmatic nucleus, melatonin, and zeitgebers — and how each signal can be used to shift your internal clock deliberately. - Intermittent Fasting and Sleep: The Timing Connection
How meal timing shapes the circadian clock and sleep quality — the research on eating windows, late dinners, and why the gut keeps its own bedtime. - What Is Delayed Sleep Phase Syndrome?
DSPS explained: why some bodies naturally fall asleep hours late, how it differs from insomnia, and the light-and-timing treatments that actually shift the clock. - The Placenta
The temporary organ that connects fetus to mother — gas and nutrient exchange, immune tolerance, hormone production, and what happens at delivery. - Homeostasis
How the body keeps its internal environment stable — temperature, pH, glucose, and more — through negative feedback loops. - Action Potentials
The electrical pulse neurons use to send signals: resting potential, ion channels, and the all-or-none wave that travels down axons.