Which of the following will bring about inhalation in human beings?
I. Contraction of diaphragm
II. Contraction of internal intercostals
III. Contraction of external intercostals
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II and III |
The given graph shows the pulmonary volumes of a healthy man recorded on spirometer.
Which of the following would be correct?
1. D can be exhaled only after maximum expiratory efforts
2. The value of B will be different for inhalation and exhalation
3. The amount of air remaining in lungs after a normal exhalation is C + D
4. Total lung capacity cannot be calculated from this graph as it includes residual volume
All the following are favorable for the formation of oxyhemoglobin at the lungs except:
1. | High PO2 | 2. | Low PCO2 |
3. | Low temperature | 4. | Low pH |
Under normal resting conditions, almost all respiratory effort is due to:
1. contraction and relaxation of diaphragm
2. elevation of rib cage
3. depression of rib cage
4. contraction of abdominal muscles
Consider the following statements:
I: | The thoracic chamber is anatomically an air tight chamber. |
II: | Any change in the volume of the thoracic cavity will be reflected in the pulmonary cavity. |
1. Both I and II are correct and II explains I
2. Both I and II are correct and I explains II
3. Both I and II are correct but II does not explain I
4. Both I and II are incorrect
Phonation is the function of:
1. | Larynx | 2. | Pharynx |
3. | Muscles of lips and tongue | 4. | Sinuses in the bones |
Identify the wrong statement with reference to the transport of oxygen.
1. | Partial pressure of CO2 can interfere with O2 binding with haemoglobin. |
2. | Higher H+ conc. 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. |
Match the following columns and select the correct option :
Column I | Column II | ||
(a) | Pneumotaxic centre | (i) | Alveoli |
(b) | O2 dissociation curve | (ii) | Pons region of the brain |
(c) | Carbonic anhydrase | (iii) | Haemoglobin |
(d) | Primary site of exchange of gases | (iv) | R.B.C. |
(a) | (b) | (c) | (d) | |
1. | (i) | (iii) | (ii) | (iv) |
2. | (ii) | (iii) | (iv) | (i) |
3. | (iii) | (ii) | (iv) | (i) |
4. | (iv) | (i) | (iii) | (ii) |
The maximum amount of air that a person can breathe out after a forced inspiration, under normal physiological conditions, would be about:
1. | 1600 ml | 2. | 2300 ml |
3. | 4500 ml | 4. | 5600 ml |
What prevents the entry of food into the larynx during deglutition?
1. A thin elastic cartilaginous flap
2. A thick fibrous cartilaginous flap
3. A thick elastic cartilaginous flap
4. A thin calcified cartilaginous flap