I: | are caused by long exposure to dust at work place. |
II: | can give rise to inflammation leading to fibrosis (proliferation of fibrous tissues) and thus causing serious lung damage. |
Statement I: | The respiratory membrane has one layer - the simple squamous epithelium of the alveoli. |
Statement II: | Oxygen diffuses faster from carbon dioxide across the respiratory membrane. |
I: | The respiratory rhythm is present in the medulla region of the brain. |
II: | Pneumotaxic centre present in cerebrum can moderate the functions of the respiratory rhythm centre. |
Statement I: | At the alveolar site where partial pressure of CO2 is high due to catabolism, CO2 diffuses into blood (RBCs and plasma) and forms HCO3– and H+. |
Statement II: | At the tissue site where pCO2 is low, the reaction proceeds in the opposite direction leading to the formation of CO2 and H2O. |
1. | RBCs contain a very high concentration of the enzyme. |
2. | It is not present at all in the plasma. |
3. | It assists rapid inter-conversion of carbon dioxide and water into carbonic acid, protons and bicarbonate ions. |
4. | The active site of the enzyme contains a zinc ion. |