Lesson 7.4.1
7.4.1 Myogenic cardiac muscle, the conducting system and ECGs Quiz: Pearson Edexcel Biology, Unit 7
20 questions
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Lesson 7.4.1, Myogenic cardiac muscle, the conducting system and ECGs: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 7: Run for your Life, written with Revision Ninja.
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The 20 questions
-
Which region of the heart acts as its natural pacemaker?
- Bundle of His
- Atrioventricular node
- Sinoatrial node
- Purkinje fibres
-
What does it mean if heart muscle tissue is described as myogenic?
- Contracts only voluntarily
- Needs hormone triggers
- Contraction originates within
- Requires nerve impulses
-
Which structure delays the electrical impulse to allow full atrial emptying?
- Atrioventricular node
- Bundle of His
- Purkinje fibres
- Sinoatrial node
-
Which structure conducts electrical impulses down the interventricular septum?
- Purkinje fibres
- Sinoatrial node
- Bundle of His
- Coronary sinus
-
Which fibres carry impulses through ventricular walls to initiate contraction from the apex?
- Collagen fibres
- Bundle of His
- Purkinje fibres
- Sinoatrial node
-
What electrical event does the P wave represent on an ECG trace?
- Atrial depolarisation
- Ventricular depolarisation
- Ventricular repolarisation
- Atrial repolarisation
-
What electrical event is represented by the QRS complex on an ECG trace?
- Ventricular repolarisation
- Atrial repolarisation
- Ventricular depolarisation
- Atrial depolarisation
-
If P waves occur without subsequent QRS complexes, which structure is failing to conduct impulses?
- Purkinje fibres
- Left bundle branch
- Sinoatrial node
- Atrioventricular node
-
Which ECG feature indicates that ventricular depolarisation is occurring more slowly than normal?
- Widened QRS complex
- Inverted T wave
- Elevated P wave
- Shortened PR interval
-
What feature of SAN cells allows spontaneous generation of electrical impulses?
- Pacemaker potential
- High threshold potential
- Resting membrane potential
- Action potential peak
-
What is the duration of one cardiac cycle if the heart rate is 75 bpm?
- 0.75 seconds
- 0.80 seconds
- 1.25 seconds
- 0.60 seconds
-
What is the heart rate if the time between consecutive R waves is 0.6 seconds?
- 80 bpm
- 120 bpm
- 100 bpm
- 60 bpm
-
Which ECG interval is used to measure the conduction delay at the AVN?
- RR interval
- ST segment
- PR interval
- QT interval
-
What allows the ventricles to fill fully before they contract?
- Ventricular repolarisation
- SAN excitation
- T wave duration
- AVN delay
-
What condition causes independent atrial and ventricular rhythms on an ECG trace?
- Complete heart block
- Atrial flutter
- Ventricular fibrillation
- Sinus tachycardia
-
What does a completely flat line on an ECG trace indicate?
- No electrical activity
- Atrial flutter
- Ventricular fibrillation
- Accelerated heartbeat
-
Which ECG feature is primarily analysed to diagnose heart rhythm and conduction disorders?
- Capillary refill time
- Waveforms and intervals
- Cardiac muscle mass
- Blood pressure waves
-
Which brain region sends autonomic nerve impulses to modulate heart rate?
- Cerebrum
- Hypothalamus
- Medulla oblongata
- Cerebellum
-
Which structure delays the electrical impulse before it passes into the ventricles?
- Bundle of His
- Sinoatrial node
- Atrioventricular node
- Purkyne fibres
-
On a normal ECG trace, what electrical event is represented by the P wave?
- Ventricular repolarisation
- Atrial repolarisation
- Ventricular depolarisation
- Atrial depolarisation
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