Q. No.Match the following columns and select the correct option:
Column-I
Column-II
(a)
Pneumotaxic Centre
(i)
Alveoli
(b)
O2 Dissociation curve
(ii)
Pons region of the brain
(c)
Carbonic Anhydrase
(iii)
Haemoglobin
(d)
Primary site of exchange of gases
(iv)
R.B.C.
Options:
(a)
(b)
(c)
(d)
1.
(i)
(iii)
(ii)
(iv)
2.
(ii)
(iii)
(iv)
(i)
3.
(iii)
(ii)
(iv)
(i)
4.
(iv)
(i)
(iii)
(ii)
The Total Lung Capacity (TLC) is the total volume of air accommodated in the lungs at the end of forced inspiration.
This includes:
| 1. | RV; IC (Inspiratory Capacity); EC (Expiratory Capacity); and ERV |
| 2. | RV; ERV; IC and EC |
| 3. | RV; ERV; VC (Vital Capacity) and FRC (Functional Residual Capacity) |
| 4. | RV (Residual Volume); ERV (Expiratory Reserve Volume); TV (Tidal Volume); and IRV (Inspiratory Reserve Volume) |
Transport of gases in alveoli takes place by:
| 1. Active transport | 2. Passive transport |
| 3. Simple diffusion | 4. None of the above |
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
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
Identify the wrong statement with reference to transport of oxygen:
| 1. | Partial pressure of CO2 can interfere with O2 binding with haemoglobin. |
| 2. | Higher H+ concentration in alveoli favours the formation of oxyhaemoglobin. |
| 3. | Low pCO2 in alveoli favours the formation of oxyhaemoglobin. |
| 4. | Binding of oxygen with haemoglobin is mainly related to partial pressure of O2. |
Select the correct events that occur during inspiration.
(a) Contraction of diaphragm
(b) Contraction of external inter-costal muscles
(c) Pulmonary volume decreases
(d) Intra pulmonary pressure increases
| 1. | (c) and (d) | 2. | (a), (b) and (d) |
| 3. | only (d) | 4. | (a) and (b) |
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. | 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
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