Gaseous Exchange

Question 1

External gaseous exchange

Answer 1

1. Blood in capillaries is deoxygenated. It contains a low concentration of oxygen and a high concentration of carbon dioxide
2. The inhaled air in the alveoli has a high concentration of oxygen and a low concentration of carbon dioxide
3. A concentration difference exists between the gases
4. Each of the gases move from a high to a low concentration along the diffusion gradient
5. Oxygen diffuses into the blood and
6. Carbon dioxide from the blood in the capillaries to the air in the alveoli

Question 2

Internal gaseous exchange

Answer 2

1. The blood that reaches the cells via the capillary blood vessels has a higher concentration of oxygen than the cells
2. In their turn the cells have a higher concentration of carbon dioxide than the blood
3. The gases move along the diffusion gradient
4. Oxygen to the cells
5. Carbon dioxide to the blood