Cardiac Physiology Concepts

The video explains the cardiac conduction pathway, detailing how the heart's electrical system controls contraction and relaxation. It covers the sinoatrial node, atrioventricular node, Bundle of His, and Purkinje Fibres, describing their roles in impulse generation and conduction. The video also discusses the autonomic nervous system's influence on heart rate and conduction velocity, and how these electrical activities are represented in an ECG.

What is the primary function of the heart's contraction?

• To produce hormones

• To generate electrical impulses

• To actively move blood

• To regulate body temperature

Which structure is known as the pacemaker of the heart?

• Purkinje Fibres

• Sinoatrial node

• Bundle of His

• Atrioventricular node

Where is the sinoatrial node located?

• Near the aorta

• In the left atrium

• At the base of the heart

• In the right atrium

What is the purpose of the AV nodal delay?

• To prevent atrial contraction

• To allow complete ventricular filling

• To synchronize with the sinoatrial node

• To speed up impulse conduction

What prevents impulses from directly passing from atria to ventricles?

• Purkinje Fibres

• Fibrous septum

• Atrioventricular node

• Sinoatrial node

Which part of the heart does the depolarization spread from the apex towards?

• The pulmonary trunk

• The atrioventricular node

• The sinoatrial node

• The base of the heart

What effect does sympathetic stimulation have on heart rate?

• Decreases heart rate

• No effect on heart rate

• Increases heart rate

• Stops the heart

What is the QRS complex associated with?

• Ventricular repolarization

• Atrial depolarization

• Ventricular depolarization

• Atrial repolarization

Which wave represents ventricular repolarization in an ECG?

• U wave

• T wave

• QRS complex

• P wave

What is the effect of parasympathetic stimulation on conduction velocity?

• No effect on conduction velocity

• Reverses conduction direction

• Decreases conduction velocity

• Increases conduction velocity