1. External respiration usually called breathing involves?

2. Respiration means?

3. We inhale about which of these amounts of air in one breathe?

4. How many times we breathe per minute?

5. Because being trapped in 'dead space' which of these amounts of inhaled air does not reach alveoli of our lungs?

6. Air we inhale has which of the following substances in it?

7. After each expiration the alveoli of lungs contain which of these amounts of air?

8. We loose which of these amounts of CO2 per minute?

9. The amount of air of respiratory importance reaching into alveoli is?

10. Our normal O2 intake per minute amounts to?