Cardiac Action Potential
title: Cardiac Action Potential tags: #FFICM notebook: ð-FFICM type: inprogress
source: [[MCQs and SBAs in Intensive Care Medicine (Oxford Higher Special Training)]]
| Flashcard | type:basic |
|---|---|
| How many phases in the cardiac action potential do the non-pacemaker cells have? | 5 |
| How many phases in the cardiac action potential do the pacemaker cells have? | 3 |
| How long does the cardiac action potential take? | 300ms |
| What number is the first phase in the cardiac action potential? | Phase 0 |
| What number is the last phase in the cardiac action potential? | Phase 4 |
| In the cardiac action potential, what number phase is initial depolarisation? | 0 |
| In the cardiac action potential, what number phase is partial repolarisation? | 1 |
| In the cardiac action potential, what number phase is the plateau phase? | 2 |
| In the cardiac action potential, what number phase is repolarisation? | 3 |
| In the cardiac action potential, what number phase is the resting potential? | 4 |
| What is the name for Phase 0 (the first phase) in the cardiac action potential? | Depolarisation |
| What is the name for Phase 1 in the cardiac action potential? | Partial Repolarisation |
| What is the name for Phase 2 in the cardiac action potential? | Plateau Phase |
| What is the name for Phase 3 in the cardiac action potential? | Repolarisation |
| What is the name for Phase 4 in the cardiac action potential? | Resting Potential |
| In the cardiac action potential, what cellular mechanism allows for Phase 0 (Depolarisation) | Opening of Fast Sodium Channels (Sodium Rushes In) |
| In the cardiac action potential, what cellular mechanism allows for Phase 1 (Partial Repolarisation) | Decrease in Sodium Permeability |
| In the cardiac action potential, what cellular mechanism allows for Phase 2 (Plateau Phase) | Opening of L-type Calcium Channels |
| In the cardiac action potential, what cellular mechanism allows for Phase 3 (Repolarisation) | Potassium Rushes In |
| In the cardiac action potential, what cellular mechanism allows for Phase 4 (Resting Potential) | Sodium-Potassium ATPase pump |
| In the cardiac action potential, is the plateau phase depolarisation, repolarisation, or something else? | It's depolarisation |
| When it comes to cardiac action potential, what is different about the cycle for pacemaker cells? | They don't have Phase 1 or 2. They don't have a stable resting potential |
| In the cardiac cycle, is diastolic relaxation active or passive? | Active |