III. Organ systems part 2: Digestive System
The Digestive System — From External Intake to Internal Fuel The digestive system is published separately because it represents the […]
How the Body Works
Using basic physiology concepts, these posts offer a simple, big-picture view of how the body is organized, how its systems interact, and why energy plays such a central role in keeping everything running.
The posts move from structure and organ systems, to digestion and absorption, to circulation and cellular energy production — gradually building a clearer understanding of how energy supports function throughout the body.
II. Organ systems Part 1
Major Organ Systems (Classical A&P Overview) In traditional anatomy and physiology (A&P), the body is divided into organ systems for
I. Levels of Organization
Levels of Organization The human body is organized into six levels of increasing complexity. Understanding these levels helps us see