Gaseous Exchange 2

What is the Bohr effect?

• Increase in ATP production

• Decrease in haemoglobin affinity towards O2

• Increase in blood pH

• Decrease in PCO2

Answer explanation

The Bohr effect refers to the decrease in haemoglobin affinity towards O2, allowing for easier release of oxygen to tissues.

What causes the increase in acidity of the blood?

• Decrease in blood pH

• Decrease in CO2 levels

• Increase in O2 levels

• Reaction of CO2 with water

Answer explanation

The increase in acidity of the blood is caused by a decrease in blood pH, indicating higher levels of hydrogen ions present.

What catalyzes the reaction of CO2 with water to form carbonic acid?

• Carbonic anhydrase

• Haemoglobin

• ATP

• Oxygen

Answer explanation

Carbonic anhydrase catalyzes the reaction of CO2 with water to form carbonic acid.

What happens to the affinity of Hb for O2 when the blood pH decreases?

• Increases

• Remains the same

• Decreases

• Becomes neutral

Answer explanation

When blood pH decreases, it indicates an increase in acidity, causing a decrease in the affinity of hemoglobin (Hb) for oxygen (O2), leading to decreased oxygen binding capacity.

What is formed when H+ reacts with haemoglobin?

• Oxyhaemoglobin

• Carbonic acid

• Haemoglobin acid

• Carbon dioxide

Answer explanation

When H+ reacts with haemoglobin, it forms Haemoglobin acid, not Oxyhaemoglobin, Carbonic acid, or Carbon dioxide.

When does Hb load more O2?

• At higher pH in tissues during exercise

• At lower pH in tissues during exercise

• At higher pH in lungs

• At lower pH in lungs

Answer explanation

Hb loads more O2 at higher pH in lungs because the higher pH promotes the formation of oxyhemoglobin, facilitating O2 binding.

What shifts the ODC to the right during the Bohr effect?

• Decrease in blood pH

• Increase in ATP production

• Changes in pH

• Increase in PCO2

Answer explanation

Changes in pH shift the ODC to the right during the Bohr effect.

What is the role of carbonic anhydrase in the Bohr effect?

• Increase blood pH

• Catalyze the reaction of CO2 with water

• Decrease in ATP production

• Increase in haemoglobin affinity towards O2

Answer explanation

Carbonic anhydrase catalyzes the reaction of CO2 with water in the Bohr effect.

What happens to the affinity of Hb for O2 when the blood pH increases?

• Decreases

• Remains the same

• Increases

• Becomes neutral

Answer explanation

When blood pH increases, it causes a shift to the left in the oxygen-hemoglobin dissociation curve, increasing the affinity of hemoglobin for oxygen.

What is the result of the Bohr shift?

• Decrease in ATP production

• Increase in CO2 levels

• Decrease in blood pH

• Increase in haemoglobin affinity towards O2

Answer explanation

The Bohr shift results in an increase in haemoglobin affinity towards O2, allowing for more efficient oxygen transport in the blood.