In case of a decrease in the carbon dioxide concentration of blood, the Hb-${\mathrm{O}}_2$ saturation curve will shift towards:

1. Right side

2. Left side

3. No change in the position of the saturation curve

4. First right and then left

Contraction of diaphragm:

1. Increases the volume of the thoracic chamber in the antero-posterior axis

2. Increases the volume of the thoracic chamber in the dorso-ventral axis

3. Decreases the volume of the thoracic chamber in the antero-posterior axis

4. Decreases the volume of the thoracic chamber in the dorso-ventral axis

Choose the wrong statement
(1)CO2 is the harmful molecule and released during catabolic reactions
(2)respiration will always require O2
(3)Breathing is a part of respiration
(4)All of the above

Each Hb can carry a maximum of ___oxygen molecules.

(1)2

(2)4

(3)8

(4)6

Binding of Oxygen with Hb is primarily related to

(1)Partial pressure of O₂

(2)Partial pressure of CO₂

(3)Hydrogen ion Concentration

(4)Temperature

Carbonic anhydrase is present in

(1)R.B.C

(2)Plasma

(3)Both A and B

(4)Tissues

The most important primary factor in determining the percent saturation of haemoglobin with oxygen is 

1. Partial pressure of oxygen

2. Acidity

3. Partial pressure of carbon dioxide

4. Temperature 

The amount of CO₂ that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher as compared to that of O₂. This is because:

Volume of air that will remain in the lungs after a normal expiration is 

1. Inspiratory capacity

2. Functional residual capacity

3. Vital capacity

4. Expiratory reserve volume 

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