When you breathe, you transport oxygen to the body's cells to keep them working, while also clearing your system of the carbon dioxide that this work generates. How do we accomplish this crucial and complex task without even thinking...

In this video we look at the pathway of air and how the alveoli assist in gases our exchange.

The Effects of Exercise on Ventilation

Histological appearance of normal lung tissue and its components.

Anatomy and branches of the thoracic (descending) aorta.

Human Body for Kids engages young, inquisitive learners, while the depth of material gets older students ready for tests. Join Kevin and his friends to explore the respiratory system.