See It · The Respiratory System

Respiratory Walkthrough

How air gets in, how oxygen and carbon dioxide trade places, how blood carries them, and how your brainstem keeps you breathing. Go at your own pace. Nothing here is graded.

Speed

Think of it like this

Quick check

Wrong answers are fine here. Read why, then try again.

Dr. Akash Garg · See It: Anatomy & Physiology · Chapter 22, The Respiratory System (OpenStax Anatomy & Physiology 2e) · Use the left and right arrow keys to move between steps. Practice next in the Respiratory Lab.
Diagrams are simplified and not to scale. Molecules, cells and the pleural space are drawn far larger than life, airways are shown with fewer branches than the real 23 levels, breathing and gas exchange are slowed or sped up so you can watch them, and volumes are OpenStax's typical young adult male values.