Q. No.Which substances when present in high level can activate the chemosensitive area present adjacent to rhythm centre?
1.
2.
3.
4.
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
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. |
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
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. |
Inspiration occurs when intra-pulmonary pressure is
1. Higher than atmospheric pressure
2. Lower than atmospheric pressure.
3. Equal to atmospheric pressure.
4. Zero compared to atmospheric pressure.
Given below a diagram of a section of an alveolus with a pulmonary capillary. Which of the following is a correct statement for diffusion of gases?
| 1. | Diffusion of O2 and CO2 from A to B or B to A takes place with the same rate. |
| 2. | O2 will diffuse faster from A to B than CO2 from B to A |
| 3. | Only O2 will diffuse from A to B not CO2 from B to A |
| 4. | Only CO2 will diffuse from B to A, not O2 from A to B |
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