Cardiac Conduction System

Question 1

What are the phases of sending an impulse down the cardiovascular conduction system?

Answer 1

1. SA node sends impulse across the atria
2. When the impulse is fully spread, the atria contract
3. Meanwhile the impulse reaches the AV node
4. There is a pause to make sure the atria have contracted
5. The impulse travels down the Bundle of His
6. The impulse travels down the Purkinje fibres
7. Once the impulse has fully spread across the ventricles, they contract

Question 2

What is the contracting phase called?

Answer 2

Systole

Question 3

What is the relaxing phase called?

Answer 3

Diastole