The pacemaker of the heart

• AV node

• SA node

• Bundle of His

• Bundle branches

Which one of the following represents the correct path for the transmission of an impulse in the intrinsic conduction system of the heart?

• AV node, Bundle of His, SA node, Purkinje fibers, bundle branches
• SA node, AV node, Bundle of His, bundle branches, Purkinje fibers
• SA node, Bundle of His, AV node, Purkinje fibers, bundle branches
• SA node, Bundle of His, bundle branches, Purkinje fibers, AV node

Which label is representing the Purkinje fibers?

• A
• C
• D
• E

Which part of the ECG corresponds to the repolarization of the ventricle?

• P wave
• QRS complex
• T wave
• none of the above

Place the following in the correct order:
     1.atria contract
     2. AV node
     3. Bundle of His
     4.Purkinje fibers
     5. SA node
     6. ventricles contract

• 5, 1, 2, 3, 4, 6
• 2, 1, 5, 3, 4, 6
• 5, 6, 2, 3, 4, 1
• 2, 6, 5, 3, 4, 1

The P wave of an ECG represents

• atrial repolarization
• atrial depolarization
• ventricular repolarization
• ventricular depolarization

Which of the following is a difference between cardiac muscle and skeletal muscle?

• unlike skeletal muscle cells, cardiac muscle cells do not rely on an influx of calcium ions for depolarization
• unlike skeletal muscle, cardiac muscle is not striated
• unlike skeletal muscle, cardiac muscle does not use a sliding filament mechanism for contraction
• unlike skeletal muscle cells, cardiac muscle cells can be autorhythmic

Which is the pace maker of the heart

• sinoatrial SA node

• Purkinje fibers

• atrioventricular AV node

• atrioventricular AV bundle

• bundle branches

The T wave corresponds to what event in the heart?

• repolarization of the atria

• depolarization of the atria

• repolarization of the ventricles

• depolarization of the ventricles

What initiates the heart beat?

• The brain

• The AVN

• Hormones such as adrenaline

• The SAN