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
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)
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.
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
Match the following columns and select the correct option :
Column - I Column - II
(a) Pneumotaxic Centre (i) Alveoli
(b) Dissociation curve (ii) Pons region of the brain
(c) Carbonic Anhydrase (iii) Haemoglobin
(d) Primary site of exchange (iv) R.B.C.
1. (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
2. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
3. (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
4. (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?
1. 2700 mL
2. 1500 mL
3. 1700 mL
4. 2200 mL
Due to increasingg air-borne allergens and pollutants, many people in urban areas are suffering from resipratory disorder causing wheezing due to:
1. reduction in the secretion of surfactants by pneumocytes
2. benign growth on mucous lining of nasal cavity
3. inflammation of bronchi and bronchioles
4. profileration of fibrous tissues and damage of the alveolar walls
Select the correct statement.
1. Expiration occurs due to external intercostal muscles.
2. Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.
3. Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure.
4. Expiration is initiated due to contraction of diaphragm.
The maximum volume of air a person can breathe in after a forced expiration is known as :
1. Expiratory Capacity
2. Vital Capacity
3. Inspiratory Capacity
4. Total Lung Capacity