Carbonic anhydrase is a zinc-containing enzyme present in RBCs. In presence of this enzyme, carbon dioxide reacts with water to form carbonic acid.

Correct Option: C

Carbonic anhydrase is a zinc-containing enzyme present in RBCs. In presence of this enzyme, carbon dioxide reacts with water to form carbonic acid.

CO₂ from the respiratory tissues to the lungs is transported by the blood in 3 ways:
(i) In dissolved state or as a physical solution: Very small amount is physically dissolved in plasma (7% i.e. ≅ 0.3 ml of CO₂ by each 100 ml of blood).
(ii) Bicarbonate ions: ≅ 70% (i.e. ≅ 2.5 ml per 100 ml of blood) CO₂ diffuses in plasma & then into RBCs where it (in the presence of carbonic anhydrase) combines with H₂O to form carbonic acid which is almost spontaneously dissociated into hydrogen ion and bicarbonate ions.
(iii) Carbaminohaemoglobin: ≅ 23% (i.e. ≅ 1 ml of CO₂ per 100 ml of blood) combines with haemoglobin forming an unstable compound.

Correct Option: A

CO₂ from the respiratory tissues to the lungs is transported by the blood in 3 ways:
(i) In dissolved state or as a physical solution: Very small amount is physically dissolved in plasma (7% i.e. ≅ 0.3 ml of CO₂ by each 100 ml of blood).
(ii) Bicarbonate ions: ≅ 70% (i.e. ≅ 2.5 ml per 100 ml of blood) CO₂ diffuses in plasma & then into RBCs where it (in the presence of carbonic anhydrase) combines with H₂O to form carbonic acid which is almost spontaneously dissociated into hydrogen ion and bicarbonate ions.
(iii) Carbaminohaemoglobin: ≅ 23% (i.e. ≅ 1 ml of CO₂ per 100 ml of blood) combines with haemoglobin forming an unstable compound.

Chemoreceptors in the medulla get stimulated by increase in CO₂ concentration in the blood of arteries. Decrease in O₂ concentration has no significant effect on chemoreceptors.

Correct Option: A

Chemoreceptors in the medulla get stimulated by increase in CO₂ concentration in the blood of arteries. Decrease in O₂ concentration has no significant effect on chemoreceptors.

Vital capacity of lungs is the largest possible expiration after largest possible inspiration that is greatest. Volume of air can be exchanged in single respiration or amount of air breathed in and out with greatest possible efforts.
VC = TRV +TV + ERV
= 3000 + 500 + 1100
= 4600 ml.

Correct Option: D

Vital capacity of lungs is the largest possible expiration after largest possible inspiration that is greatest. Volume of air can be exchanged in single respiration or amount of air breathed in and out with greatest possible efforts.
VC = TRV +TV + ERV
= 3000 + 500 + 1100
= 4600 ml.

Transport of CO₂ is much easier than O₂ because of the higher solubility of CO₂ than O₂. Almost 7% of CO₂ is transported in dissolved state in plasma. About 23% of the CO₂ is transported in the form of carbamino haemoglobin. 70% of CO₂ is transported in the form of bicarbonate ions. CO₂ reacts with water present in plasma.
Carbonic acid is unstable & gives H⁺ and HCO₃^–. H⁺ bind with haemoglobin to maintain the pH of blood while HCO₃^– remain in the blood and carries the CO₂ to lungs.

Correct Option: A

Transport of CO₂ is much easier than O₂ because of the higher solubility of CO₂ than O₂. Almost 7% of CO₂ is transported in dissolved state in plasma. About 23% of the CO₂ is transported in the form of carbamino haemoglobin. 70% of CO₂ is transported in the form of bicarbonate ions. CO₂ reacts with water present in plasma.
Carbonic acid is unstable & gives H⁺ and HCO₃^–. H⁺ bind with haemoglobin to maintain the pH of blood while HCO₃^– remain in the blood and carries the CO₂ to lungs.