Alveoli in the lungs are lined by:
1. a simple squamous epithelium.
2. a pseudostratified ciliated columnar epithelium.
3. a simple cuboidal epithelium.
4. a transitional epithelium.
Assertion (A): | Oxidized hemoglobin carries maximum oxygen in the human blood. |
Reason (R): | Oxidized hemoglobin has more affinity for oxygen than deoxygenated hemoglobin. |
In the light of the above statements choose the correct answer from the options given below:
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | The Bohr effect enables the body to adapt to changing conditions and makes it possible to supply extra oxygen to tissues that need it the most. |
Reason (R): | A lower pH in strenuously metabolizing tissues promotes the dissociation of oxygen from haemoglobin, and allows the surrounding tissues to obtain enough oxygen to meet their demands. |
In the light of the above statements choose the correct answer from the options given below:
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): | Corticosteroids are very effective in the management of bronchial asthma. |
Reason (R): | Corticosteroids are potent anti-inflammatory agents. |
In the light of the above statements choose the correct answer from the options given below:
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Most of the aquatic arthropods respire through:
1. diffusion over entire body surface | 2. gills |
3. tracheae and tracheoles | 4. skin |
The trachea divides into a right and a left primary bronchus at the level of:
1. 2nd thoracic vertebra | 2. 3rd thoracic vertebra |
3. 5th thoracic vertebra | 4. 12th thoracic vertebra |
Consider the following two statements:
I: | The lungs are situated in the thoracic chamber which is anatomically an air-tight chamber. |
II: | This arrangement is essential as we cannot directly alter the thoracic volume. |
1. | Both I and II are correct and II correctly explains I |
2. | Both I and II are correct but II does not explain I |
3. | I is correct and II is incorrect |
4. | Both I and II are incorrect |
Regarding pulmonary capacities, the maximum volume of air a person can breathe in after a forced expiration can also be defined as:
1. Total volume of air a person can inspire or expire after a normal inspiration or expiration
2. Volume of air that will remain in the lungs after a normal expiration
3. Maximum volume of air a person can breathe out after a forced inspiration
4. Total volume of air accommodated in the lungs at the end of a forced inspiration
Which of the following will not be equal in normal physiological conditions?
1. | Partial pressure of oxygen in deoxygenated blood and partial pressure of oxygen in tissues |
2. | Partial pressure of carbon dioxide in alveoli and partial pressure of carbon dioxide in oxygenated blood |
3. | Partial pressure of oxygen in oxygenated blood and partial pressure of oxygen in alveoli |
4. | Partial pressure of carbon dioxide in tissues and partial pressure of carbon dioxide in deoxygenated blood |
The binding of oxygen with hemoglobin is primarily related to:
1. | Partial pressure of carbon dioxide |
2. | Partial pressure of oxygen |
3. | H+ ion concentration in body fluids |
4. | Presence of 2,3-DPG in erythrocytes |