Support available 24/7
Get the appHelp centerLog in
OnCallBank
Get started

The medical question bank that shows its sources.

Exam-style questions for medical students and doctors, vetted by physicians and explained option by option. Every answer is referenced to the textbook page, and you can double-check any answer with AI to see its precise source.

Get started See plans and pricing
  • Vetted by medical professionals
  • Double-check any answer with AI
  • Exam communities
  • Support 24/7
Question 12 of 40Block: Cardiology
Untimed 00:00
CardiologyHigh-yieldMedium

A 62-year-old man comes to the emergency department with 40 minutes of crushing substernal chest pain radiating to the jaw, with sweating and nausea. Blood pressure is 92/58 mm Hg and pulse is 48/min. ECG shows ST-segment elevation in leads II, III and aVF, with reciprocal ST depression in lead aVL.

Occlusion of which artery is most likely responsible?

Educational objective

ST elevation in II, III and aVF places the infarct in the inferior wall, which the right coronary artery supplies in most patients. Bradycardia (SA or AV nodal ischemia) and hypotension (right ventricular involvement) further point to the RCA.

Reference: [Textbook title], [edition], chapter [__], page [___].
Your editorial team adds the exact textbook page to every answer.
Not sure? Double-check this answer with AI.

See the precise source and a detailed explanation.

Checking the answer against its sources
AI double-checkQuestion 12, Cardiology
Confirmed
Your answer

Answer supported by the sources
Precise source[Textbook title], [edition]Chapter [__], page [___], section “[section name]”
“[The exact passage from the textbook that supports this answer appears here.]”
Detailed explanation
  1. ST elevation in II, III and aVF localizes the infarct to the inferior wall.
  2. The inferior wall is supplied by the right coronary artery in most people.
  3. Bradycardia and hypotension point to SA/AV nodal and right ventricular involvement, which is also RCA territory.
Also supported by: [Second source], page [___]

Demo result. In OnCallBank, the AI double-checks any answer against the referenced sources.

Ask me anything about this question. For example, why the heart rate is low, or why it isn't the circumflex.

Sample responses for this demo. The full AI tutor answers any question in the bank.

Physician-vettedWritten and reviewed by medical professionals
Referenced to the pageCheck every answer in the textbook yourself
Double-check with AIVerify any answer and see its precise source
Help around the clockReal people, 24 hours a day, 7 days a week
00,000+Questions
00,000+Students and doctors
00+Countries
00%Pass rate

Everything you need to pass, in one place

OnCallBank brings the question bank, explanations, references, AI help and your study tools together, on every device you own.

Content you can trust

Questions that hold up to scrutiny, with the sources to prove it.

  • A vast medical QBank

    A large, constantly growing bank of high-yield, exam-style questions modeled on the most popular medical exams, across every major subject and system.

  • Double-check any answer with AI

    Not sure about an answer? Ask the AI to verify it. It tells you the precise source, down to the book, edition and page, with a detailed explanation.

  • Vetted by medical professionals

    Every question and answer is written, reviewed and approved by a team of practicing physicians before it reaches you.

  • Referenced to the page

    Each answer cites the medical textbook, edition and page number it is based on, so you can open the book and check it yourself.

  • Every option explained

    You see why the correct answer is right and why each of the other options is wrong, not just which letter to pick.

  • Exclusive illustrations and graphs

    Original diagrams, flowcharts and graphs, drawn for OnCallBank, that make complex mechanisms easy to remember.

Practice your way

Build the exact session you need, from a ten-minute review to a full-length mock exam.

  • Timed or untimed

    Practice under real exam timing to build pace, or switch to untimed tutor mode and learn as you go.

  • Randomized questions and options

    Shuffle question order and answer choices so you learn the concept, not the position of the right answer.

  • Important only

    Sort by high-yield to focus on the questions most likely to matter on exam day, or work through the whole bank.

  • Buy only the section you need

    Need cardiology but not the rest? Purchase individual sections and pay only for what helps you pass.

Study tools built in

Everything you would normally keep in five different apps, attached to the question you are on.

  • A smart AI tutor

    Ask about any question and get a clear explanation from an AI built specifically for medical exam content and its sources.

  • Notes and flashcards

    Write notes on any question and turn key facts into flashcards with spaced review.

  • Highlight anything

    Highlight text in question stems and explanations, just as you would on the exam.

  • Smart highlights

    Key clues and high-yield facts are highlighted for you, so you never miss the detail that decides the answer.

  • Study checklists

    Organize your thinking and your schedule with checklists attached to every topic and course.

  • In-depth courses

    Detailed courses that teach each topic from first principles before you test yourself on it.

Study together

Join a community of people preparing for the same exam as you.

  • Exam communities

    Every exam has its own community, so you study with people facing the same questions, timeline and pressure.

  • Discuss any question

    Every question has its own discussion thread. Share your reasoning, ask why, and learn from how others think.

  • Solve together

    Work through blocks with your group in real time and compare answers before you reveal the explanation.

  • Arrange study sessions

    Schedule group sessions, invite members and get reminders, all inside OnCallBank.

  • Compare notes

    Share your notes and flashcard decks with your group and build better ones together.

Study anywhere, any time

Your bank, your notes and your progress follow you from device to device.

  • Every device, full features

    Phone, tablet, iPad or computer, on iOS, Android, Windows or Mac. Nothing is cut down on smaller screens.

  • Progress that follows you

    Start a block on the website and finish it in the app. Your answers, notes and analytics stay in sync.

  • Download for offline use

    Save the QBank to your phone and keep studying on a plane, on the ward or anywhere without signal.

  • Support around the clock

    Real people are available 24 hours a day, 7 days a week, for anything from billing to a question you want reviewed.

Explore all features

Double-check with AI

Double-check any answer. See the exact source.

Not sure an answer is right? Ask the OnCallBank AI to verify it. It checks the answer against the referenced medical literature and tells you the precise source, down to the book, edition, chapter and page, with a detailed explanation of why.

  • Confirms or challenges any answer, including your own
  • Gives the precise source: book, edition, chapter and page
  • Quotes the passage that supports the answer
  • Explains the reasoning step by step
  • Then answers any follow-up question as your AI tutor
See how double-check worksTry it on the sample question
Answer double-checkedQuestion 12, Cardiology
Confirmed
Answer checkedC. Right coronary artery
Precise source[Textbook title], [edition]Chapter [__], page [___], section “[section name]”
“[The exact passage from the textbook that supports this answer appears here.]”
Detailed explanation
  1. ST elevation in II, III and aVF localizes the infarct to the inferior wall.
  2. The inferior wall is supplied by the right coronary artery in most people.
  3. Bradycardia and hypotension point to SA/AV nodal and right ventricular involvement, which is also RCA territory.
Also supported by: [Second source], page [___]

Explanations you can actually remember

Each explanation walks through the reasoning, explains every option and ends with a short educational objective. Original illustrations and graphs make the hard mechanisms click.

  • Why the correct answer is correct
  • Why each incorrect option is incorrect
  • Textbook, edition and page number for every answer
  • Exclusive illustrations, flowcharts and graphs
  • Smart highlights on the clues that decide the answer

Only need one subject? Buy just that section.

Choose the full QBank, or pick the sections you need for your exam and pay only for those. You can add more at any time.

Pick the sections you need

Build my plan

From first question to exam day

  1. Choose your bank

    Get the full QBank or only the sections you need. Filter by subject, system or high-yield.

  2. Practice your way

    Run timed blocks that feel like the real exam, or untimed tutor mode with instant explanations.

  3. Review and improve

    Read every explanation, check the reference, ask the AI tutor and track your weak areas.

Start on your laptop. Finish on your phone.

Full functionality on every device, with your progress, notes and flashcards in sync. Download the QBank to study offline.

  • iPhone and Android
  • iPad and tablets
  • Windows and Mac
  • Offline mode
Download on theApp Store Get it onGoogle Play
OnCallBank communities

Study with people taking the same exam

Join the community for your exam and prepare together. Discuss questions, solve blocks as a group, arrange study sessions and compare notes with people who are on the same path.

  • Discuss any question

    Every question has its own thread.

  • Solve together

    Work through blocks live as a group.

  • Arrange sessions

    Schedule group study with reminders.

  • Compare notes

    Share notes and flashcard decks.

Explore communities
Your exam study communityMembers preparing for the same exam and date
Thu20:00
Group session: renal and acid-baseSolve 20 questions together, then review
Going
Discussion on question 1042
A
Member

I picked B because of the low bicarbonate. Why is the answer C?

M
Member

Calculate the anion gap first. It is normal here, so think about diarrhea or renal tubular acidosis. I shared my notes on this.

Shared notesDouble-checked with AI

What students and doctors say

Real reviews from people preparing for their exams with OnCallBank.

Testimonial slot 1: replace with a real review
“Add a short, genuine quote from one of your students or doctors here. Specific results and details build the most trust.”
Student nameYear, medical school, country
Testimonial slot 2: replace with a real review
“Add a short, genuine quote from one of your students or doctors here. Specific results and details build the most trust.”
Student nameYear, medical school, country
Testimonial slot 3: replace with a real review
“Add a short, genuine quote from one of your students or doctors here. Specific results and details build the most trust.”
Student nameYear, medical school, country

Frequently asked questions

Who is OnCallBank for?

Medical students preparing for licensing and board exams, and doctors preparing for postgraduate, specialty and residency exams, anywhere in the world.

Who writes and checks the questions?

Every question is written and reviewed by a team of medical professionals. Each answer is referenced to a specific medical textbook and page so you can verify it yourself.

Can I buy only one subject?

Yes. You can buy the full QBank or only the sections you need, such as cardiology or pharmacology. You can add more sections at any time.

Does it work on my phone?

Yes. OnCallBank works fully on phones, tablets, iPads and computers, through the website or the iOS and Android apps. Your progress syncs between them.

Can I study offline?

Yes. Download the QBank in the mobile app and study without an internet connection. Your answers sync the next time you are online.

Can I double-check an answer with AI?

Yes. On any question, select Double-check with AI. The AI verifies the answer against the referenced medical sources and shows you the precise source, including the book, edition, chapter and page, with a detailed explanation.

What are OnCallBank communities?

Communities bring together people preparing for the same exam. You can discuss questions, solve blocks together, arrange study sessions and compare notes.

How does the AI tutor work?

Open any question and tap Ask AI. The tutor is built specifically for medical exam questions and their source material, and explains the concept, each option and the reference in plain language.

Start practicing with OnCallBank today

Create your account in a minute, then choose the full QBank or only the sections you need.

Get startedSee pricing