Carbon Dioxide Transport in the Blood - Post Test

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Question 1 of 10

1. Question
As blood passes through systemic capillaries, the enzyme carbonic anhydrase catalyses…
- Conversion of gaseous CO2 to dissolved CO2
- Conversion of carbonic acid to bicarbonate ion
- Conversion of dissolved CO2 to carbonic acid
- Binding of carbon dioxide to haemoglobin, thus displacing oxygen
- None of the above
Question 2 of 10

2. Question
At which of the following sites is the partial pressure of carbon dioxide (PCO2) highest?
- Systemic venous blood
- Expired air
- Systemic arterial blood
- Alveolar gas
- Approximately the same in all of the above
Question 3 of 10

3. Question
The facilitated diffusion of CO2 describes which of the following?
- Migration of CO2 from the tissue to the erythrocyte along the pressure gradient
- Diffusion of CO2 to the alveoli facilitated by haemoglobin transport
- CO2 saturation of binding sites on the RBC membrane which facilitates its conversion to carbonic acid (H2CO3)
- Transport of CO2 as bicarbonate in plasma
Question 4 of 10

4. Question
The chloride shift refers to:
- The uptake of carbon dioxide in the RBC that is associated with the exit of Cl-
- Chloride ions are exchanged for bicarbonate to maintain electro neutrality after the latter are produced on uptake of CO2 into the cell
- Like H+ a rise in Cl- shifts the O2-Hb dissociation curve to the right
- Cl- combines with Na+ so producing NaCl which shifts the osmotic pressure in a favourable direction to maintain cell turgidity
Question 5 of 10

5. Question
The Haldane effect relates to which of the following?
- The increased affinity of deoxyhaemoglobin for protons
- The readiness with which CO2 dissolves across most biological membranes and into biological liquids
- The effect that CO2 exerts on the respiratory drive such that when abolished, hypoxia ensues
- The influence of CO2 on the cellular metabolism and H+ generation in septicaemia
Question 6 of 10

6. Question
In acid base balance which of the following is correct?
- Respiratory acidosis is always associated with metabolic acidosis
- Respiratory acidosis is always associated with metabolic alkalosis
- Respiratory compensation is the first means of regaining pH balance
- Respiratory compensation is the most definitive means of achieving pH equipoise
- In a primary respiratory problem pCO2 and pH are divergent
Question 7 of 10

7. Question
Consequences of respiratory acidosis include all of the following except:
- Pulmonary vasoconstriction
- Cerebral vasodilatation
- Impaired epinephrine and norepinephrine release
- Increased minute ventilation
- Hypoxia for a fixed FiO2
Question 8 of 10

8. Question
Changes associated with hypocarbia include:
- Hyperoxia
- Hyperkalaemia
- Hyperphosphataemia
- Hypercalcaemia
- Hypernatraemia
Question 9 of 10

9. Question
Breathing a gas mixture with 4% CO2 ultimately leads to which of the following?
- Hypoventilation
- A decrease in heart rate
- A stimulation of central chemo receptors
- An inhibition of peripheral chemo receptors
- A decrease in CSF hydrogen-ion concentration
Question 10 of 10

10. Question
Which of the following is most likely to cause respiratory acidosis?
- Moving from high altitude to sea level
- Untreated diabetes mellitus (DM)
- Kidney failure
- Vomiting
- Hypoventilation

Carbon Dioxide Transport in Blood

Carbon Dioxide Transport in the Blood – Post Test

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