Dissociation of oxygen from blood to tissue is facilitated by

1. Low ${\mathrm{pO}}_2$ at the level of tissue

2. Metabolic activities of the tissue

3. High ${\mathrm{pCO}}_2$ at the level of tissue

4. All of these

Select the incorrectly matched pair

The number of oxygen molecules (O${}_2$) 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${}_2$ 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

Which of the following statements are correct with respect to transportation of gases?

A. Blood transport ${\mathrm{CO}}_2$ comparatively easily because of its higher solubility

B. ${\mathrm{CO}}_2$ diffuses into blood, passes into RBCs and reacts with water to form ${\mathrm{H}}_2{\mathrm{CO}}_3$

C. 20-25 percent ${\mathrm{CO}}_2$ is carried by haemoglobin as carbamino-haemoglobin

D. Oxyhaemoglobin of erythrocytes is basic in nature and it increases pH of blood

1. A only

2. A & B only

3. A, B & C only

4. A, B, C & D

Total volume of air a person can expire after a normal inspiration is 

A. Tidal volume               B. TV + ERV

C. Expiratory capacity      D. ERV + RV

1. A only

2. B & C only

3. A, B & C only

4. A,B,C & D

The maximum volume of air a person can breathe in after a forced expiration includes

1. ERV (Expiratory Reserve volume)

2. TV (Tidal Volume)

3. IRV ( Inspiratory Reserve Volume)

4. All of these