Q. No.The diaphragm and external intercostal muscles are ________ when expiration occurs.
1. contracted
2. relaxed
3. flexed
4. both relaxed (diaphragm) and flexed (intercostal
muscles)
muscles)
Breathing is best described as
1. Utilisation of O2 by the cells for catabolic reaction.
2. Transport of gases by the blood.
3. The movement of air into and out of the lungs.
4. Diffusion of gases across alveolar membrane
Partial pressure of in alveoli of lungs:
1. Is equal to that in the deoxygenated blood.
2. Is more than that in the deoxygenated blood.
3. Is less than that in the deoxygenated blood.
4. Is more than that of in alveoli.
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 |
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.
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
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.
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