Question

Indicate the sequence of the spread of the action potential through the following heart structures:

Answer 1

The sequence of the spread of the action potential through the heart structures involves the SA node, atria, AV node, bundle branches, Purkinje fibers, and ventricles.

Step-by-step explanation:

The sequence of the spread of the action potential through the heart structures is as follows:

1. The action potential starts at the sinoatrial (SA) node.
2. From the SA node, it sweeps across the atria.
3. After reaching the atrioventricular (AV) node, there is a delay of approximately 100 ms.
4. Then, the impulse travels through the AV bundle and bundle branches to the Purkinje fibers.
5. The impulse spreads to the contractile fibers of the ventricles.
6. Ventricular contraction begins.