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.

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.

The total volume of air that can be expelled from the lungs after maximum inspiration and then expiring to the maximum is known as the vital capacity. The volume of air that remains inside lungs at the end of maximum forceful expiration is the residual volume. Expiratory reserve volume is the maximum extra volume of air that can be expired by forceful expiration after a normal tidal expiration. Total lung capacity is the maximum volume of air that can be contained in the lungs after maximum inspiration.

Correct Option: B

The total volume of air that can be expelled from the lungs after maximum inspiration and then expiring to the maximum is known as the vital capacity. The volume of air that remains inside lungs at the end of maximum forceful expiration is the residual volume. Expiratory reserve volume is the maximum extra volume of air that can be expired by forceful expiration after a normal tidal expiration. Total lung capacity is the maximum volume of air that can be contained in the lungs after maximum inspiration.

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.