Understanding CO2 Transport in Blood 190/1

What is the role of carbonic anhydrase in CO2 transport?

• Carbonic anhydrase facilitates the conversion of CO2 to bicarbonate for efficient transport in the blood.

• Carbonic anhydrase breaks down CO2 into carbon and oxygen.

• Carbonic anhydrase converts bicarbonate back to CO2 for exhalation.

• Carbonic anhydrase is responsible for oxygen transport in the blood.

How does CO2 bind to haemoglobin in the tissues?

• CO2 binds to hemoglobin by directly replacing oxygen in the lungs.

• CO2 binds to hemoglobin in the tissues by forming carbaminohemoglobin and through the Bohr effect, which enhances oxygen release.

• CO2 binds to hemoglobin through ionic bonds that do not affect oxygen release.

• CO2 is transported in the blood as bicarbonate only, with no interaction with hemoglobin.

What happens to CO2 at the alveoli?

• CO2 remains in the blood without any exchange.

• CO2 is converted into oxygen in the alveoli.

• CO2 diffuses from the blood into the alveoli.

• CO2 is absorbed from the alveoli into the blood.

What is the chemical reaction facilitated by carbonic anhydrase?

• The conversion of carbon dioxide and water to carbonic acid (H2CO3).

• The synthesis of oxygen from carbon dioxide and hydrogen.

• The breakdown of glucose into carbon dioxide and water.

• The conversion of carbonic acid to carbon dioxide and water.

What are the products formed when CO2 diffuses into the blood?

• Oxygen (O2) and nitrogen (N2)

• Glucose (C6H12O6) and lactic acid (C3H6O3)

• Carbon monoxide (CO) and water (H2O)

• Carbonic acid (H2CO3), bicarbonate (HCO3-), and hydrogen ions (H+) are formed.

How does the partial pressure of CO2 affect its transport?

• It prevents CO2 from diffusing into the lungs.

• The partial pressure of CO2 affects its transport by driving diffusion from tissues to blood and from blood to lungs.

• It increases the solubility of CO2 in blood.

• It has no effect on CO2 transport in the body.

What is the significance of bicarbonate (HCO3–) in CO2 transport?

• Bicarbonate (HCO3–) facilitates the transport of CO2 in the blood and helps maintain pH balance.

• Bicarbonate (HCO3–) is a waste product of CO2 metabolism.

• Bicarbonate (HCO3–) is primarily involved in oxygen transport.

• Bicarbonate (HCO3–) inhibits CO2 transport in the lungs.

How much CO2 is delivered to the alveoli per 100 ml of deoxygenated blood?

• 30 ml of CO2 per 100 ml of deoxygenated blood

• 52 ml of CO2 per 100 ml of deoxygenated blood

• 75 ml of CO2 per 100 ml of deoxygenated blood

• 40 ml of CO2 per 100 ml of deoxygenated blood

What is the relationship between CO2 levels and catabolism in tissues?

• Higher CO2 levels indicate increased catabolism in tissues.

• Higher CO2 levels indicate decreased catabolism in tissues.

• CO2 levels have no effect on catabolism in tissues.

• Lower CO2 levels indicate increased catabolism in tissues.

How does the concentration of carbonic anhydrase differ between RBCs and plasma?

• Carbonic anhydrase is absent in RBCs but present in plasma.

• The concentration of carbonic anhydrase is much higher in RBCs than in plasma.

• The concentration of carbonic anhydrase is the same in RBCs and plasma.

• The concentration of carbonic anhydrase is higher in plasma than in RBCs.