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Physiology · Part I · Sample
Why does persistent vomiting make the blood alkaline?
ABicarbonate is lost in the vomit
BH⁺ and Cl⁻ are lost, so bicarbonate is not cancelled
CFluid loss causes acidosis
Why: the acid is thrown away, so the bicarbonate sent into the blood is never cancelled.
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Learn morePhysiology · Year 2Second pass running40,000 past questions
Question Source YearAnswer Slide
AnWinging of the scapulaAnatomy · Upper limbFinal paper2023CheckedSlide 22
PhWhy vomiting causes alkalosisPhysiology · Acid–baseClass recall2024CheckedSlide 14
BcRate-limiting step of glycolysisBiochemistry · MetabolismLecturer's slides2022CheckedSlide 9
PtQuadriceps lag after knee surgeryPhysiotherapy · 300 LevelPosting test2024Second passSlide 31
LsCasts in a urine depositLab Science · HistopathologyExaminers' styleNewCheckedSlide 6
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Why vomiting causes alkalosis → Acid–base lecture, slide 14.
The reasoning behind every answer. Normal, abnormal, so, the trap. You learn why, not just which letter.
Learn moreSingle best answer · Question 7 of 20
Why does a patient with persistent vomiting become alkalotic?
AMetabolic acidosis, because fluid is lostYour answer
BMetabolic alkalosis, low chloride and potassiumRight
CRespiratory alkalosis from pain
DRespiratory acidosis from aspiration
The reasoning
- 1Normal
Parietal cells send H⁺ into the stomach and HCO₃⁻ into the blood. The pancreas later neutralises the acid, so the two cancel.
- 2Abnormal
Vomiting throws the H⁺ and Cl⁻ away. Lost volume drives aldosterone: the kidney trades Na⁺ for H⁺ and K⁺.
- 3So
Metabolic alkalosis, low chloride, low potassium, and an acid urine.
- 4The trap
“Acidosis, because fluid is lost.” That is diarrhoea, which loses bicarbonate.
You fell for the trap
Option A is diarrhoea's picture, not vomiting's.
Exam Intelligence. Stop revising 100 topics. Revise the 20 your examiners keep setting.
See your topicsYear 2 · University of IbadanLast 10 years of papers
Topic Set in 10 yearsLikelihood Your accuracy Review
AnBrachial plexusAnatomy · Paper 18/10High82%Done
PhAcid–basePhysiology · Paper 27/10High58%20 due
BcEnzyme kineticsBiochemistry · Paper 24/10Medium74%3 due
PhCardiac cyclePhysiology · Paper 16/10Likely69%Done
AnEmbryology of the heartAnatomy · Paper 22/10Low71%Later
Hot topic
Brachial plexus: set in 8 of the last 10 papers.
Weak topic found
Acid–base: 58% across 40 answers. Practise these 20.
Recommended next
- Practise 20 acid–base questions
- Re-read the acid–base note
- Timed mock on Friday
Mocks and progress. Mocks timed like the real one. Then see exactly where your marks go.
Sit a mockWhere your marks goThis term
2,140
1,620
1,410
980
640
AttemptedCorrectReasonedRevisedMastered
Anatomy82%
Physiology74%
Biochemistry61%
Biggest drop
Correct → Reasoned (−13%). Read the reasoning, not just the letter.
Mock exam · 50 questions
38:12
Question 36 of 50
Your mocks+12
Mock 1 · Year 2 62%Mock 2 · Year 2 68%Mock 3 · Year 2 74%
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