Q. No.Mark the incorrect statement regarding the transport of gas.
1.
About 97% of O2 is transported by RBC.
2.
Nearly 20-25% of CO2 is transported by RBC.
3.
Every 100 ml of deoxygenated blood deliver 4 ml of CO2 to the alveoli.
4.
Every 100 ml of oxygenated blood deliver 20 ml of O2 to the body tissues
The maximum volume of air a person can breathe in after a forced expiration is
| (A) | Vital capacity | (B) | ERV + TV + IRV |
| (C) | TLC – RV | (D) | ERV – RV |
1. (A) only
2. (A) & (B) only
3. (A), (B) & (C) only
4. (A), (B), (C) & (D)
Select the correct statement:
| 1. | Expiration occurs due to external intercostal muscles. |
| 2. | Intrapulmonary pressure is lower than atmospheric pressure during inspiration. |
| 3. | Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure. |
| 4. | Expiration is initiated due to the contraction of the diaphragm. |
Oxygen binding to haemoglobin in blood is:
| 1. | directly proportional to the concentration of in the medium. |
| 2. | inversely proportional to the concentration of in the medium. |
| 3. | directly proportional to the concentration of CO in the medium. |
| 4. | independent of the concentration of CO in the medium. |
The amount of CO2 that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher as compared to that of O2. This is because:
| 1. | Solubility coefficient of CO2 is higher |
| 2. | Solubility coefficient of CO2 is lesser |
| 3. | Amount of gases in blood is independent of partial pressures of the gases in the atmosphere |
| 4. | Arterial blood contains more O2 than CO2 |
The most important primary factor in determining the percent saturation of haemoglobin with oxygen is
1. Partial pressure of oxygen
2. Acidity
3. Partial pressure of carbon dioxide
4. Temperature
Read the following four statements (a-d) and select the option which includes all correct ones only :-
| (a) | Exchange of O2 and CO2 at alveoli and tissue occur by active transport. |
| (b) | Long exposure to industrial dust leads to inflammation leading to fibrosis and thus causing serious lung damage. |
| (c) | EICM and IICM are muscles actively involved in normal and forced breathing respectively. |
| (d) | Spirometer is unable to find out the functional residual capacity and total lung capacity. |
1. b, c and d
2. b and d
3. a, b and d
4. a, b, c and d
Oxygen haemoglobin dissociation curves are represented as A and B. Select the incorrect interpretation
| 1. | Curve B has increased ability to unload O2 in tissues, with respect to curve A. |
| 2. | The shift in a curve from B to A is associated with decreased P50 value. |
| 3. | At elevated temperature the curve will shift from B to A. |
| 4. | Shift in a curve from A to B is associated with decreased O2 carrying capacity of haemoglobin. |
In case of a decrease in the carbon dioxide concentration of blood, the Hb- saturation curve will shift towards:
1. Right side
2. Left side
3. No change in the position of the saturation curve
4. First right and then left
What happens to the volume of the pulmonary cavity when there is an increase in the volume of the thoracic chamber?
1. It decreases
2. It increases
3. It remains the same
4. First decreases and then increases
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