Refractory periods — purpose?
Prevent premature contractions and re-entry arrhythmias.
Conduction pathway order?
SA node, atria, AV node, bundle of His, bundle branches, Purkinje fibers, ventricles.
Conduction pathway — sequence?
SA node → atria → AV node → Bundle of His → bundle branches → Purkinje fibers.
SA node — role?
Heart's natural pacemaker, initiates impulses.
Cardiac action potential — phase 2?
Plateau phase due to Ca²⁺ influx balancing K⁺ efflux.
Atrial conduction — function?
spreads electrical activity through atria.
AV node — delay purpose?
Allows atrial contraction before ventricles.
Bundle of His — function?
Transmits impulses from AV node to bundle branches.
Purkinje fibers — role?
Distribute impulses rapidly to ventricles.
Cardiac action potential — phase 0?
Na⁺ influx causes rapid depolarisation.
Metti alla prova le tue conoscenze con 10 domande su Cardiac Electrical Physiology and Arrhythmias.
1. What is the conduction pathway in the heart?
2. Which structure acts as the heart's natural pacemaker and initiates electrical impulses?
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