1. | Provides surface for diffusion of O2 and CO2 |
2. | It clears inhaled air from foreign particles |
3. | Inhaled air is humidified |
4. | Temperature of inhaled air is brought to body temperature |
Which of the following disorders represents decrease in respiratory surface due to damaged alveolar walls?
1. Hypocapnia
2. Bronchitis
3. Asthma
4. Emphysema
In the regulation of respiration, a chemosensitive area adjacent to the rhythm centre in the medulla region of the brain, is highly sensitive to:
1. \(HCO^-_3\)
2. \(CO_2\)
3. \(O_2\)
4. \(N_2\)
(a) | It includes ERV, TV and IRV |
(b) | Total volume of air a person can inspire after a normal expiration |
(c) | The maximum volume of air a person can breathe in after forced expiration |
(d) | It includes ERV, RV and IRV. |
(e) | The maximum volume of air a person can breathe out after a forced inspiration. |
1. | Medulla | 2. | Pons |
3. | Thalamus | 4. | Cerebrum |
Under normal physiological conditions in human being every 100 ml of oxygenated blood can deliver _____________ml of O2 to the tissues.
1. 10 ml
2. 2 ml
3. 5 ml
4. 4 ml
1. | IRV + ERV + TV | 2. | IRV + ERV |
3. | IRV + ERV + TV + RV | 4. | IRV + ERV + TV - RV |
(A) | Diffusion of gases (O2 and CO2) across alveolar membrane. |
(B) | Diffusion of O2 and CO2 between blood and tissues |
(C) | Transport of gases by the blood |
(D) | Pulmonary ventilation by which atmospheric air is drawn in and CO2 rich alveolar air is released out. |
(E) | Utilisation of O2 by the cells for catabolic reactions and resultant release of CO2 |
1. | (D), (A), (C), (B), (E) | 2. | (C), (B), (A), (E), (D) |
3. | (B), (C), (E), (D), (A) | 4. | (A), (C), (B), (E), (D) |
Select the favorable conditions required for the formation of oxyhemoglobin at the alveoli.
1. High pO2, high pCO2, less H+, higher temperature
2. Low pO2, low pCO2, more H+, higher temperature
3. High pO2, low pCO2, less H+, lower temperature
4. Low pO2 high pCO2 more H+, higher temperature
The partial pressures (in mm Hg) of oxygen (O2) and carbon dioxide (CO2) at alveoli (the site of diffusion) are :
1. pO2 = 95 and pCO2 = 40
2. pO2 = 159 and pCO2 = 0.3
3. pO2 = 104 and pCO2 = 40
4. pO2 = 40 and pCO2 = 45