| Statement I: | The alveoli have ciliated cells in them to help expel dust particles that make it this far down into the respiratory tract. |
| Statement II: | Gas exchange between the lungs and the blood, and between the blood and tissue fluid, is an active transport process. |
| Statement I: | Intrapulmonary pressure must be greater than atmospheric pressure for air to enter the lungs. |
| Statement II: | Intrapulmonary pressure must be lower than atmospheric pressure for air to be exhaled out of the lungs. |
| Statement I: | The pO2 of the blood normally has no direct effect on respiration. |
| Statement II: | The pO2 of the oxygenated blood is higher than the pO2 of the alveolar air. |
| I: | increased temperature |
| II: | increased pH |
| III: | increased carbon dioxide |
| 1. | Emphysema | 2. | Asthma |
| 3. | Tuberculosis | 4. | Common cold |
| I: | A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to CO2 and hydrogen ions. |
| II: | Receptors associated with aortic arch and carotid artery can recognise changes in O2 concentration and send necessary signals to the rhythm centre for remedial actions. |
| III: | The role of oxygen in the regulation of respiratory rhythm is most significant. |
| a. | pCO2 is high and pO2 is low |
| b. | dissociation of CO2 from carbamino-haemoglobin takes place |
| c. | pCO2 is low and pO2 is high |
| d. | more binding of carbon dioxide to haemoglobin occurs |