Question

c conduction system coordinates contraction of the The intrinsic chamb ers by setting the direction and speed of in the intrinsic conduction system, the normal function of the With AV node is to Within the intrinsic conduction system, the function of the AV bundle is to Within the intrinsic conduction system, the function of the Purkinje fibers is to 4. A heartbeat involves action potentials from the specialized cells of the intrinsic conduction system spreading to 5. 6. In a normal ECG wave tracing, atrial repolarization is hidden by the components of the intrinsic conduction system in the correct order of depolarization: tach heartbeat involves both electrical and mechanical events. ow are pacemaker cells involved in each of these events?

Answer 1

1. The intrinsic conduction system coordinates contraction of heart chambers by setting direction and speed of Heart depolarisation.

2. Within the intrinsic coordination system, the normal function of AV node is to delay impulse briefly, allowing atria to contract before ventricle .

3. Within the intrinsic coordination system, the function of the AV bundle is to link between atria and ventricle .

4. Within the intrinsic coordination system, the function of Purkinje fibres is to convey impulse throughout ventricular walls .

5. A heart beat involves action potential from the specialised cells of intrinsic conduction system spreading to contractile cells. It is called electrical event.

6. In normal ECG wave tracing, atrial repolarization is hidden by QRS interval .

7. Components of intrinsic conduction system are:

SA node - AV node - bundle of HIS - bundle branches - Purkinje fibres.