Primary MCQs-February 2013
In February 2013 there were 2 exams: Exams run under the "old" syllabus (for those carrying a pass in one section) AND a full exam under the new syllabus (for everyone else siting).
Primary MCQ papers
Unclassified so far
Fluid and Electrolyte Physiology
NEW Something about factors causing/preventing interstitial fluid accumulation: Alt: Beneficial factors preventing interstitial edema formation:
- A. High compliance of interstitial system
- B. ?
- C. ?
Repeat: PaCO2 at 200mmHg, what is the electrolyte disturbance?
- A. Hyperkalemia
- B. ?
- C. ?
REPEAT During heavy exercise, sweat is:
- A: hyper-osmolar to plasma
- B: hypo-osmolar to plasma
- C: iso-osmolar
Acid Base Physiology
NEW Comment pH change from 7.4 to 7.1, how does the H+ ions concentration vary?
- A: increases by 50%
- B: increases by 150%
- C: increases by 100%
- D: decreases by 20%
- E: no change as it is buffered
REPEAT Acid base values showing respiratory alkalosis with high bicarb:
- B: climber at altitude (acclimatised)
- C: metabolic acidosis
- D: vomiting
- E: 5 minutes of hyperventilation
RE47 [Mar03] [Jul03] [Feb04] [Jul04] [Mar05] The amount of oxygen dissolved in plasma is
- A. 0.03ml O2/100ml at PaO2 100mmHg
- B. 6ml O2/100ml breathing 100% O2 at 3 atmospheres
- C. 6ml O2/100ml breathing room air at 3 atmospheres
- D. 0.3ml O2/l breathing room air at 1 atmosphere
- E. 6 ml O2/100mls breathing 100% O2
Repeat: At what height does atmospheric pressure becomes half?
- A. 1500m
- C. 5500M (correct)
- D. 7,700m
- E. 10,500m
Which ONE of the following is TRUE?
- A: ?
- B: PR interval occurs during atrial diastole
- D: the duration of systole is roughly 1/3 of cardiac cycle, at a heart rate of 75/min
NEW In an unfit/untrained person, which mechanism accounts for the increase in cardiac output?
- B:?increase skeletal muscle blood flow
- D: increased contractility
- E: increased heart rate
Heart rate is decreased by:
- A: atrial receptors
- E: ventricular receptors
REPEAT: ECG changes in hypokalemia
- A: increased QT
- B: increased QRS
- C: decreased PR
REPEAT: Closure of the ductus arteriosus occurs due to:
- A: oxygen mediated smooth muscle contraction
REPEAT: Baroreceptors found everywhere except:
- A: Carotid body
REPEAT CV84 Comparing the aorta and radial artery: (same options as prev)
REPEAT CV26 During increased intrathoracic pressure of Valsalva manoeuvre:
Actions of ADH in the kidney:
- B: something about collecting ducts
- C: increase aquaporins in basolateral surface
- D: cause vasoconstriction by actions on V1 (or?V2) receptors
REPEAT MCQ-feb12-37 Actions of PTH on the kidney:
NEW Lower oesophageal sphincter:
- A: tone is only due to smooth muscle
- B: ?
- E: tone increases when intragastric pressure increases
Blood & Immunology
- A: have a nucleus and granules (OR- A: have no nucleus but with granules)
- B: something about half life in plasma (maybe 8-10 days)
- C: 4-7µm in size
Endocrine and Metabolism
Which of the following hormones is LEAST likely to be inotropic?
- A: adrenal corticoids
- B: adrenal medullary hormones
- C: insulin
- D: glucagon
- E: thyroxine
Comment Genuinely horrible question. All five have inotropic effects. Insulin is the least likely however, as the experimental data for its inotropic effects were 1) primarily in vitro 2) variable between studies and hence, inconclusive.
Muscle and NMJ Physiology
Maternal, Fetal and Neonatal Physiology
Question on impedance...capacitance...??
REPEAT MCQ-feb12-70 Absolute Humidity: same options as previously