The Body as an Integrated System

In this opening lesson, Professor Samuel Reed introduces physiology as the study of how the body works, with a focus on the body as an integrated system rather than a collection of isolated parts. Students learn how cells, tissues, organs, and organ systems cooperate to maintain internal stability while responding to changing demands.

The lesson emphasizes three foundational ideas that will return throughout the course: organization, communication, and homeostasis. By the end, students should be able to explain why digestion, circulation, breathing, movement, temperature control, and hormone signaling must be understood together.