Respiratory rhythm centre is present in the medulla and is primarily responsible for regulation of respiration as per demands of the body tissues. This centre is regulated by
1. Pneumotaxic centre present pons region
2. Central chemoreceptor adjacent to rhythm centre
3. Peripheral chemoreceptor present in aortic arch and carotid artery
4. All of these
Maximum volume of air a person can breathe after forceful expiration is termed as
1. Inspiratory capacity
2. Vital capacity
3. Expiratory capacity
4. Functional residual capacity
In the given figure, identify the muscles involved in raising the rib cage
1. External intercostals
2. Internal intercostals
3. External obliques
4. Abdominal recti
Dissociation of oxygen from blood to tissue is facilitated by
1. Low at the level of tissue
2. Metabolic activities of the tissue
3. High at the level of tissue
4. All of these
Select the incorrectly matched pair
1. |
Additional volume of air person can expire by a forceful expiration |
Expiratory reserve volume |
2. |
Maximum amount of air expelled forcefully from lungs after maximum forceful inspiration |
Vital capacity |
3. |
Volume of air inspired and expired during a normal respiration |
Tidal volume |
4. |
When a person breathes normally, the amount of air which remains in the lungs after normal expiration |
Residual volume |
The number of oxygen molecules (O) that can conjugate with one molecule of haemoglobin are
1. 2
2. 4
3. 8
4. 6
Central chemoreceptors in the brain respond to changes in the
1. Oxygen concentration in blood
2. Carbon dioxide concentration in CSF
3. Oxygen concentration in CSF
4. Rate of oxidation of food content in the cell
In which of the following disorders alveolar walls are damaged, surface area for gaseous exchange is reduced and the air sacs remain filled with air even after expiration?
1. Pneumonia
2. Coryza
3. Emphysema
4. SARS
The pO in systemic arteries and systemic veins is respectively
1. 95, 40 mmHg
2. 95, 45 mmHg
3. 40, 95 mmHg
4. 104, 40 mmHg
Mark the incorrect combination with respect to pulmonary capacities
1. IC = TV + IRV
2. FRC = RV + ERV
3. VC = TLC + RV
4. EC = TV + ERV