Respiratory+System

Respiratory and Circulatory Introduction Go to Respiratory System Overview and answer the next two questions by reading the text below the figures. 1. Why is oxygen needed by humans 2. Explain the function of our lungs and how oxygen gets into our blood stream.

Go to the Cardiovascular Overview

3. Explain the flow of blood between heart, lungs, and legs

Go to the Circulatory Overview

4. Explain how oxygen gets to cells