1. In both external and internal respiration, Carbon Dioxide and
Oxygen diffusions occur independently with each gas moving from
areas of (high, low) concentration to areas of (high, low)
concentration. **Choose either high or low for both sentences**
2. Oxygen in the blood system is transported by binding to the
protein _________________.
3. On the other hand, Carbon Dioxide in the blood system may be
transported by _______________, __________________, or
_____________________.