Conduction System

Question 1

The SA node

Answer 1

In the wall of the right atrium
Starts the impulse and sends it across both atria

Question 2

AV node

Answer 2

In the middle wall of the heart between atria and ventricles
Receive impulse from SA node, causes a delay to allow for atrial systole to finish and passes it onto the bundle of his

Question 3

The bundle of his

Answer 3

In the middle wall of the heart
Transmits impulse to the bottom of the heart via brundle batches

Question 4

Purkinje fibres

Answer 4

In the wall of the ventricles
Causes impulse to penetrate into ventricles walls causing ventricular systole
The most powerful contraction

Question 5

Atrial diastole

Answer 5

No electrical impulse
Atria fills with blood from vena cava and pulmonary vein
Av valves closed
Atrial pressure rises above ventricular pressure
Blood start to pass passively into ventricles

Question 6

Atrial systole

Answer 6

SA node fibres electrical impulse across atria
Atria contracts
AV valves forced open
Remaining blood is pumped into ventricles
Semi lunar valves closed

Question 7

ventricular diastole

Answer 7

impulse received by AV node
delayed for a moment to allow atrial systole to complete
AV valves closed

Question 8

between ventricular diastole and systole

Answer 8

AV nodes sends impulse down the right and left bundle of HIS into the purkinje fibres

Question 9

ventricular systole

Answer 9

ventricles contract from the bottom upwards
semilunar valves forced open
blood is pumped out of ventricles into pulmonary artery and aorta