ANZCA Primary MCQs Exam 2025
Questions and Answers
Hb is a good buffer because:
A. Large concentration
B. 38 imidazole groups on Histidine residues - ANSWER✔✔-A
Which of the following is classified as a "strong ion"?
A. phosphate
B. chloride
C. albumin - ANSWER✔✔-B
Bicarbonate buffer most important extracellular buffer system because::
A. Because CO2 and HCO3- are present in large concentrations
B. Because of carbonic anhydrase
C. Because CO2 is dealt with by the lung and HCO3- by the kidneys
D. Of the Henderson-Hasselbach equation - ANSWER✔✔-C - open ended buffer system
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,Pure water at pH 7 has hydrogen ion concentration of
A. 0 nanomol/L
B. 40 nanomol/L
C. 70 nanomol/L
D. 100 nanomol/L
E. 1000 nanomol/L - ANSWER✔✔-D
Hydrogen ion concentration in plasma with a PH of 7.1
A. 80 nmol
B. 40 nmol
C. 120 nmol
D. 0 nmol :
E. ? - ANSWER✔✔-A
Which of these increases vasopressin (ADH) secretion?
A. Increase in arterial BP
B. Moving to erect position
C. Increased pressure venoatria junction
D. Reduced effective oncotic pressure plasma
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,E. Increase ECF volume - ANSWER✔✔-B
Hartmann's solution contains
A. 154 mmol/L Na+:
B. 2 mmol/L Ca++:
C. 2 mmol/L K+:
D. 154 mmol/L Cl:
E. 3 mmol/L Mg2+ - ANSWER✔✔-B
Cardiogenic shock is the result of:
A. decreased arterial pressure
B. cardiac arrhythmia
C. decreased stroke volume
D. decreased venous return
E. increased venous pressure - ANSWER✔✔-C
Administration of a large volume of Normal Saline (0.9%) is likely to produce
A. no change in acid base status
B. hyperchloraemic metabolic acidosis
C. hypochloraemic metabolic acidosis
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, D. hyperchloraemic metabolic alkalosis
E. hypochloraemic metabolic alkalosis - ANSWER✔✔-B
Torsades de Pointes:
A. results from SVT
B. more likely in bradycardia in susceptible pts
C. treated with 150mg of amiodarone over 30 minutes
D. results from hypermagnesaemia - ANSWER✔✔-B
Carotid sinus massage is used in SVT to:
A. Decrease sympathetic stimulation of SA node:
B. Increase vagal outflow to SA node:
C. Decrease sympathetic stimulation to AV node:
D. Increase vagal outflow to AV node:
E. Decrease conductivity - ANSWER✔✔-D
Peripheral vascular resistance:
A. can be calculated from mean arterial pressure/ pulmonary wedge pressure:
B. units are dynes∙s∙cm−5
C. equals diving pressure mutiplied by CO - ANSWER✔✔-B
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 4
Questions and Answers
Hb is a good buffer because:
A. Large concentration
B. 38 imidazole groups on Histidine residues - ANSWER✔✔-A
Which of the following is classified as a "strong ion"?
A. phosphate
B. chloride
C. albumin - ANSWER✔✔-B
Bicarbonate buffer most important extracellular buffer system because::
A. Because CO2 and HCO3- are present in large concentrations
B. Because of carbonic anhydrase
C. Because CO2 is dealt with by the lung and HCO3- by the kidneys
D. Of the Henderson-Hasselbach equation - ANSWER✔✔-C - open ended buffer system
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,Pure water at pH 7 has hydrogen ion concentration of
A. 0 nanomol/L
B. 40 nanomol/L
C. 70 nanomol/L
D. 100 nanomol/L
E. 1000 nanomol/L - ANSWER✔✔-D
Hydrogen ion concentration in plasma with a PH of 7.1
A. 80 nmol
B. 40 nmol
C. 120 nmol
D. 0 nmol :
E. ? - ANSWER✔✔-A
Which of these increases vasopressin (ADH) secretion?
A. Increase in arterial BP
B. Moving to erect position
C. Increased pressure venoatria junction
D. Reduced effective oncotic pressure plasma
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
,E. Increase ECF volume - ANSWER✔✔-B
Hartmann's solution contains
A. 154 mmol/L Na+:
B. 2 mmol/L Ca++:
C. 2 mmol/L K+:
D. 154 mmol/L Cl:
E. 3 mmol/L Mg2+ - ANSWER✔✔-B
Cardiogenic shock is the result of:
A. decreased arterial pressure
B. cardiac arrhythmia
C. decreased stroke volume
D. decreased venous return
E. increased venous pressure - ANSWER✔✔-C
Administration of a large volume of Normal Saline (0.9%) is likely to produce
A. no change in acid base status
B. hyperchloraemic metabolic acidosis
C. hypochloraemic metabolic acidosis
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
, D. hyperchloraemic metabolic alkalosis
E. hypochloraemic metabolic alkalosis - ANSWER✔✔-B
Torsades de Pointes:
A. results from SVT
B. more likely in bradycardia in susceptible pts
C. treated with 150mg of amiodarone over 30 minutes
D. results from hypermagnesaemia - ANSWER✔✔-B
Carotid sinus massage is used in SVT to:
A. Decrease sympathetic stimulation of SA node:
B. Increase vagal outflow to SA node:
C. Decrease sympathetic stimulation to AV node:
D. Increase vagal outflow to AV node:
E. Decrease conductivity - ANSWER✔✔-D
Peripheral vascular resistance:
A. can be calculated from mean arterial pressure/ pulmonary wedge pressure:
B. units are dynes∙s∙cm−5
C. equals diving pressure mutiplied by CO - ANSWER✔✔-B
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 4
