Cardiac conduction system

Question 1

What is the cardiac conduction systems role?

Answer 1

Specialised muscle tissue conducts impulse through the myocardium
Cells don’t contract, distribute, initiate impulses in the heart to coordinate the cardiac cycle

Question 2

Where is the Sinoatrial Node (SA) located and what is its function?

Answer 2

Located in RA (posterior)
Self exciting mass of specialised cardiac muscles
Serves as a pacemaker
Generates the impulse for the heartbeat

Question 3

What happens from the SA node?

Answer 3

Impulses spread to the atrial syncytium- causing atrial contraction to occur and then junctional fibres

Question 4

What does junctional fibres lead to?

Answer 4

The next major component, the AV node

Question 5

Where s the AV node located and what it its role?

Answer 5

Passes impulses to the AV bundle
Delays the signal until atria have finished contracting
Located in the inertial septum (between the ventricles)