Q. No.Name the pulmonary disease in which alveolar surface area involved in gas exchange is drastically reduced due to damage in the alveolar walls.
| 1. | Pleurisky | 2. | Emphysema |
| 3. | Pneumonia | 4. | Asthma |
When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?
| 1. | Falling O2 concentration |
| 2. | Rising CO2 concentration |
| 3. | Falling CO2 concentration |
| 4. | Rising CO2 and falling O2 concentration |
Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs:
| 1. | as bicarbonate ions |
| 2. | in the form of dissolved gas molecules |
| 3. | by binding to R.B.C |
| 4. | as carbamino-haemoglobin |
The figure shows a diagrammatic view of the human respiratory system with labels A, B, C, and D. Select the option that gives the correct identification, main function, and/or characteristics:
| 1. | B-pleural membrane- surrounds ribs on both sides to provide cushion against rubbing. |
| 2. | C-alveoli-thin walled vascular bag-like structures for the exchange of gases. |
| 3. | D-lower end of the lungs-diaphragm pulls it down during inspiration. |
| 4. | A trachea-long tube supported by complete cartilaginous rings for conducting inspired air. |
Which one of the following is the correct statement for respiration in humans?
| 1. | Cigarette smoking may lead to inflammation of the bronchi |
| 2. | Neural signals from the pneumotaxic centre in the pons region of the brain can increase the duration of inspiration |
| 3. | Workers in grinding and stone-breaking industries may suffer from lung fibrosis |
| 4. | About 90% of carbon dioxide (CO2) is carried by haemoglobin as carbaminohaemoglobin |
Two friends are eating together at a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of:
| 1. | diaphragm | 2. | neck |
| 3. | tongue | 4. | epiglottis |
The figure given below shows a small part of the human lung where exchange of gases takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function?
| 1. | A – Alveolar cavity – main site of exchange of respiratory gases |
| 2. | D – Capillary wall – exchange of O2 and CO2 takes place here |
| 3. | B – Red blood cell – transport of CO2 mainly. |
| 4. | C – Arterial capillary – passes oxygen to tissues |
A large proportion of oxygen is left unused in the human blood even after its uptake by body tissues. This O2:
1. raises the Pco2 blood to 75 mm of Hg
2. is enough to keep oxyhaemoglobin
3. helps in releasing more O2 to the epithelial tissues
4. acts as a reserve during muscular exercise
Bulk of carbon dioxide (CO2) released from body tissues into the blood is present as:
1. carbaminohaemoglobin in RBCs
2. bicarbonate in blood plasma and RBCs
3. free CO2 in blood plasma
4. 70% carbaminohaemoglobin and 30% as bicarbonate
Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?
| 1. | The lungs can be made fully empty by forcefully breathing out all air from them |
| 2. | One can breathe out air totally without oxygen |
| 3. | One can breathe out air through Eustachian tubes by closing both the nose and the mouth. |
| 4. | One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all. |
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