Q. No.Consider the characters of a respiratory control center in humans:
I. It is located in pons
II. It moderates the functions of respiratory rhythm center
III. Its absence results in an increase in depth of respiration
The respiratory control center is:
1. Pneumotaxic center
2. Apneustic center
3. Chemosensitive zone
4. Dorsal group
I. It is located in pons
II. It moderates the functions of respiratory rhythm center
III. Its absence results in an increase in depth of respiration
| 1. | Inflammation of bronchioles; decreased respiratory surface |
| 2. | Increased number of bronchioles; increased respiratory surface |
| 3. | Increased respiratory surface; inflammation of bronchioles |
| 4. | Decreased respiratory surface; inflammation of bronchioles |
| Column I | Column II | ||
| (a) | Tidal volume | (i) | 2500-3000 mL |
| (b) | Inspiratory Reserve | (ii) | 1100-1200 mL volume |
| (c) | Expiratory Reserve | (iii) | 500-550 mL volume |
| (d) | Residual volume | (iv) | 1000-1100 mL |
| Options: | (a) | (b) | (c) | (d) |
| 1. | (iii) | (ii) | (i) | (iv) |
| 2. | (iii) | (i) | (iv) | (ii) |
| 3. | (i) | (iv) | (ii) | (iii) |
| 4. | (iv) | (iii) | (ii) | (i) |
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 |
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 |
At lungs carbon dioxide diffuses out of the pulmonary capillaries into the alveoli. As a result hemoglobin’s ability to bind to oxygen would:
1. be unstable
2. stay the same
3. decrease
4. increase
Respiration is under neural and chemical regulation. The receptors for chemical regulation are located in the:
| 1. | walls of the carotid and aortic arteries and in the medulla oblongata. |
| 2. | walls of the carotid and aortic arteries only. |
| 3. | medulla oblongata and in the walls of the superior and inferior vena cavas. |
| 4. | walls of the carotid and aortic arteries and in the walls of the superior and inferior vena cavas. |
What is the primary function of the Pneumotaxic Center in the regulation of respiration in human beings?
1. It increases the rate and depth of breathing
2. It decreases the rate of and depth of breathing
3. It controls the “switch off’ point of inspiration
4. It initiates the “Herring-Breur” reflex
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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