Q. No.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
| 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 |
Listed below are four respiratory capacities (1-4) and four jumbled respiratory volumes of a normal human adult.
| Respiratory capacities | Respiratory volume | |
| (a) | Residual volume | 2500 mL |
| (b) | Vital capacity | 3500 mL |
| (c) | Inspiratory reserve volume | 1200 mL |
| (d) | Inspiratory capacity | 4500 mL |
Which one of the following is the correct matching of two capacities and volumes?
1. (a) 2500 mL, (d) 4500 mL
2. (c) 1200 mL, (a) 2500 mL
3. (b) 4500 mL, (c) 2500 mL
4. (d) 4500 mL, (b) 3500 mL
What is true about RBCs in humans?
| 1. | They carry about 20-25 per cent of CO2 |
| 2. | They transport 99.5 per cent of O2 |
| 3. | They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma |
| 4. | They do not carry CO2 at all |
An increase from pH 7.2 to pH 7.4 around hemoglobin causes:
| 1. | hemoglobin to release all bound oxygen molecules. |
| 2. | an increase in the affinity of hemoglobin to bind oxygen molecules. |
| 3. | hemoglobin to denature. |
| 4. | an increase in the binding of H+ by hemoglobin. |
Increased asthmatic attacks in certain seasons are related to:
1. hot and humid environment
2. eating fruits preserved in tin containers
3. inhalation of seasonal pollen
4. low-temperature
The 'blue baby' syndrome results from:
1. excess of chloride
2. methaemoglobin
3. excess of dissolved oxygen
4. excess of TDS (Total Dissolved Solids)
The majority of carbon dioxide produced by our body cells is transported to the lungs:
1. dissolved in the blood
2. as bicarbonates
3. as carbonates
4. attached to haemoglobin
Pneumotaxic centre which can moderate the functions of the respiratory rhythm centre is present at:
1. Pons region in brain
2. Thalamus
3. Spinal cord
4. Right cerebral hemisphere
Haemoglobin is:
1. An oxygen carrier in human blood
2. A protein used as a food supplement
3. An oxygen scavenger in root nodules
4. A plant protein with high lysine content
The exchange of gases in the alveoli of the lungs takes place by:
1. osmosis
2. simple diffusion
3. passive transport
4. active transport
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