Cardiac Conduction System

Question 1

What is the order of impulse travel?

Answer 1

1. SAN - Sinoatrial Node
2. AVN - Atrioventricular Node
3. Bundle of his
4. Bundle branches
5. Purkinje fibres
6. Ventricular systole

Question 2

What is the AVN

Answer 2

The atrioventricular node; collects the signal fired from the SAN

Question 3

What is the cardiac cycle?

Answer 3

The mechanical event of one heartbeat

Question 4

What is the atrial systolic phase?

Answer 4

Valves are forced open - atria contract and blood is forced into the ventricles

Question 5

What is the pathway of the blood?

Answer 5

Start
1. Venae Cavae 
2. Right Atrium
3. Tricuspid Valve
4. Right ventricle
5. Pulmonary semi-lunar valve
6. Pulmonary artery
7. Lungs
Re - entering
8. Pulmonary vein
9. Left Atrium
10. Bicuspid valve 
11. Left ventricle
12. Aortic semi-lunar valve
13. Aorta 
14. Body

Question 6

What is the SAN?

Answer 6

The start of the conduction system - aka the hearts pacemaker

Question 7

What is the ventricular systole phase?

Answer 7

Blood is in the ventricles. Ventricles contract to increase pressure within the chambers forcing aortic and pulmonary semi-lunar valves to open flowing towards the Aorta or the Pulmonary Artery