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:

1.	Solubility coefficient of CO2 is higher
2.	Solubility coefficient of CO2 is lesser
3.	Amount of gases in blood is independent of partial pressures of the gases in the atmosphere
4.	Arterial blood contains more O2 than CO2

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 

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

Oxygen binding to haemoglobin in blood is:

Select the correct statement: